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PUBL NO IRC21
TROUBLE SHOOTING HANDBOOK
PROP-JET ENGINE MODELS 501-013 -013A -0130
15 NOVEMIUR 1963
Allison DIVISLON OF GENERAL MOTORS CORPORATIO
INDIANAPOLIS 6 INDIANA
Edition 1 1 February 1962 1000
Edition 2 15 November 1963 1200
COMPileD AND PUllISHD IV ALLISON PUllICATION SUVICU
A
PREFACE
This Trouble Shooting Handbook is provided to furnish 11 convenient for locating the cause(s) ot an engine malfunction The use of HTip Charts will help reduce delays and maintenance down-time
and will minimize time lost in changing components which cannot be applicable to a given problem
The charts contained herein are designed only to determine the malshyfunction cause Refer to the 501-D13 Engine Maintenance Manual Publication No lRC2 for appropriate corrective action
This handbook is assembled primarily for ground maintenance pereonnel and any others concerned with maintenance of the engine
TABLE OF CONTENTS
Subject
Introduction to Troubl Shootq
Cbort I Rpm Stagnation with Low T T
Cbort 2 Rpm StaUon with HIh T l T 10
Cbort 3 Rpm eyc line 12
Cbort 4 - Uaq Prime Enelne Doe Not Whl-otT or LIht-otT Above 3300 Rpm
Cbort 5 Enelne Wihts-oft Uoq Prime with Fuel Fne from Eneln Tall Pipe
Cbort 8 Enelne Doe Not LIht-oft Uq Prime with No Fuel Fo from Tall Pipe 18
Cbort 7 - Ene_ Llaht-off Above 3300 Rpm with Prime 20
Chart 8 Low Horsepower (Filel Flow Low)
Cbort 9 Low Horaepower (Fuel Flow High) 24
Cbort 10 Rpm Cycllnamp or No indication 25
Cbort 11 - Hih Horaepower (Fuel Flow RIhl or Power Lever Advanced to AHen Tt T with Other Enlin 26
Cbort 12 Power Lever Muat Be Retarded to Allen Tl T with Other Enelne 28
Cbort 13 T 1 T Hlh Low Cycllne or No indication 30
Cbort 14 - Fuel BOOBt Pump Pressure Warnlnamp Wbt Abnormally On 31
Chart 15 Oil Temperature Out of Limits or No Indication 32
Chart 16 HorsepOwer HIb Low CycUnc or No Indication 33
Cbort 17 Bela Llht OUt (Taxi) or Beta LIht On (FIlht) 34
Chart 18 Prop Blades Do Not Move Toward Feather On Auto-feather Check 35
Chart 19 Prop Blades Do Not Move Toward Feather on Auto-feather Cbeck 36
Chart 20 - Prop Blades Do Not Move Toward Feather on Auto-feather Check 38
TABLE OF CONTENTS (Cont)
CIIart II bull _ et1 G on P Out of Llmltl or Suddn SbUt of SI) PSI or M 40
CIIart 23 bull R_ell G 011 Pre FluetuatlDf 4J
CIIart IT Ule to Hold Low Rpm on No 4 EJgtc1De 50
CIIart n - PU amplid RG 011 Pr Out of Limit Slmltillleouty 44
CIIart 24 LoI of _u~lloo Gear 011 P amplid Rpm 46
CIIart 26 - Pow Lever Cot be ReUrded Below Fllchl Idle 48
CIIart 18 - Unable to Sele~t Lo Rpm 49
GIIar1 28 - No PrIm el PIImp Fallu LIcht OurlDf Start 51
CIIart 29 - TI T AboYe LImit Ourlnc start 52
Chart 30 - Hlfh TI T at Low Rpm 54
CIIart 31 ExI Z1De 011 C pt1 56
Chart 3J bull HllhSabllixed TI T at Take-off Power 59
Chart 33 - Low stabUiad Tl T at Take-off Power 61
Chart 34 Engine Compreaaor Surge 63
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Edition 1 1 February 1962 1000
Edition 2 15 November 1963 1200
COMPileD AND PUllISHD IV ALLISON PUllICATION SUVICU
A
PREFACE
This Trouble Shooting Handbook is provided to furnish 11 convenient for locating the cause(s) ot an engine malfunction The use of HTip Charts will help reduce delays and maintenance down-time
and will minimize time lost in changing components which cannot be applicable to a given problem
The charts contained herein are designed only to determine the malshyfunction cause Refer to the 501-D13 Engine Maintenance Manual Publication No lRC2 for appropriate corrective action
This handbook is assembled primarily for ground maintenance pereonnel and any others concerned with maintenance of the engine
TABLE OF CONTENTS
Subject
Introduction to Troubl Shootq
Cbort I Rpm Stagnation with Low T T
Cbort 2 Rpm StaUon with HIh T l T 10
Cbort 3 Rpm eyc line 12
Cbort 4 - Uaq Prime Enelne Doe Not Whl-otT or LIht-otT Above 3300 Rpm
Cbort 5 Enelne Wihts-oft Uoq Prime with Fuel Fne from Eneln Tall Pipe
Cbort 8 Enelne Doe Not LIht-oft Uq Prime with No Fuel Fo from Tall Pipe 18
Cbort 7 - Ene_ Llaht-off Above 3300 Rpm with Prime 20
Chart 8 Low Horsepower (Filel Flow Low)
Cbort 9 Low Horaepower (Fuel Flow High) 24
Cbort 10 Rpm Cycllnamp or No indication 25
Cbort 11 - Hih Horaepower (Fuel Flow RIhl or Power Lever Advanced to AHen Tt T with Other Enlin 26
Cbort 12 Power Lever Muat Be Retarded to Allen Tl T with Other Enelne 28
Cbort 13 T 1 T Hlh Low Cycllne or No indication 30
Cbort 14 - Fuel BOOBt Pump Pressure Warnlnamp Wbt Abnormally On 31
Chart 15 Oil Temperature Out of Limits or No Indication 32
Chart 16 HorsepOwer HIb Low CycUnc or No Indication 33
Cbort 17 Bela Llht OUt (Taxi) or Beta LIht On (FIlht) 34
Chart 18 Prop Blades Do Not Move Toward Feather On Auto-feather Check 35
Chart 19 Prop Blades Do Not Move Toward Feather on Auto-feather Cbeck 36
Chart 20 - Prop Blades Do Not Move Toward Feather on Auto-feather Check 38
TABLE OF CONTENTS (Cont)
CIIart II bull _ et1 G on P Out of Llmltl or Suddn SbUt of SI) PSI or M 40
CIIart 23 bull R_ell G 011 Pre FluetuatlDf 4J
CIIart IT Ule to Hold Low Rpm on No 4 EJgtc1De 50
CIIart n - PU amplid RG 011 Pr Out of Limit Slmltillleouty 44
CIIart 24 LoI of _u~lloo Gear 011 P amplid Rpm 46
CIIart 26 - Pow Lever Cot be ReUrded Below Fllchl Idle 48
CIIart 18 - Unable to Sele~t Lo Rpm 49
GIIar1 28 - No PrIm el PIImp Fallu LIcht OurlDf Start 51
CIIart 29 - TI T AboYe LImit Ourlnc start 52
Chart 30 - Hlfh TI T at Low Rpm 54
CIIart 31 ExI Z1De 011 C pt1 56
Chart 3J bull HllhSabllixed TI T at Take-off Power 59
Chart 33 - Low stabUiad Tl T at Take-off Power 61
Chart 34 Engine Compreaaor Surge 63
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
PREFACE
This Trouble Shooting Handbook is provided to furnish 11 convenient for locating the cause(s) ot an engine malfunction The use of HTip Charts will help reduce delays and maintenance down-time
and will minimize time lost in changing components which cannot be applicable to a given problem
The charts contained herein are designed only to determine the malshyfunction cause Refer to the 501-D13 Engine Maintenance Manual Publication No lRC2 for appropriate corrective action
This handbook is assembled primarily for ground maintenance pereonnel and any others concerned with maintenance of the engine
TABLE OF CONTENTS
Subject
Introduction to Troubl Shootq
Cbort I Rpm Stagnation with Low T T
Cbort 2 Rpm StaUon with HIh T l T 10
Cbort 3 Rpm eyc line 12
Cbort 4 - Uaq Prime Enelne Doe Not Whl-otT or LIht-otT Above 3300 Rpm
Cbort 5 Enelne Wihts-oft Uoq Prime with Fuel Fne from Eneln Tall Pipe
Cbort 8 Enelne Doe Not LIht-oft Uq Prime with No Fuel Fo from Tall Pipe 18
Cbort 7 - Ene_ Llaht-off Above 3300 Rpm with Prime 20
Chart 8 Low Horsepower (Filel Flow Low)
Cbort 9 Low Horaepower (Fuel Flow High) 24
Cbort 10 Rpm Cycllnamp or No indication 25
Cbort 11 - Hih Horaepower (Fuel Flow RIhl or Power Lever Advanced to AHen Tt T with Other Enlin 26
Cbort 12 Power Lever Muat Be Retarded to Allen Tl T with Other Enelne 28
Cbort 13 T 1 T Hlh Low Cycllne or No indication 30
Cbort 14 - Fuel BOOBt Pump Pressure Warnlnamp Wbt Abnormally On 31
Chart 15 Oil Temperature Out of Limits or No Indication 32
Chart 16 HorsepOwer HIb Low CycUnc or No Indication 33
Cbort 17 Bela Llht OUt (Taxi) or Beta LIht On (FIlht) 34
Chart 18 Prop Blades Do Not Move Toward Feather On Auto-feather Check 35
Chart 19 Prop Blades Do Not Move Toward Feather on Auto-feather Cbeck 36
Chart 20 - Prop Blades Do Not Move Toward Feather on Auto-feather Check 38
TABLE OF CONTENTS (Cont)
CIIart II bull _ et1 G on P Out of Llmltl or Suddn SbUt of SI) PSI or M 40
CIIart 23 bull R_ell G 011 Pre FluetuatlDf 4J
CIIart IT Ule to Hold Low Rpm on No 4 EJgtc1De 50
CIIart n - PU amplid RG 011 Pr Out of Limit Slmltillleouty 44
CIIart 24 LoI of _u~lloo Gear 011 P amplid Rpm 46
CIIart 26 - Pow Lever Cot be ReUrded Below Fllchl Idle 48
CIIart 18 - Unable to Sele~t Lo Rpm 49
GIIar1 28 - No PrIm el PIImp Fallu LIcht OurlDf Start 51
CIIart 29 - TI T AboYe LImit Ourlnc start 52
Chart 30 - Hlfh TI T at Low Rpm 54
CIIart 31 ExI Z1De 011 C pt1 56
Chart 3J bull HllhSabllixed TI T at Take-off Power 59
Chart 33 - Low stabUiad Tl T at Take-off Power 61
Chart 34 Engine Compreaaor Surge 63
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
TABLE OF CONTENTS
Subject
Introduction to Troubl Shootq
Cbort I Rpm Stagnation with Low T T
Cbort 2 Rpm StaUon with HIh T l T 10
Cbort 3 Rpm eyc line 12
Cbort 4 - Uaq Prime Enelne Doe Not Whl-otT or LIht-otT Above 3300 Rpm
Cbort 5 Enelne Wihts-oft Uoq Prime with Fuel Fne from Eneln Tall Pipe
Cbort 8 Enelne Doe Not LIht-oft Uq Prime with No Fuel Fo from Tall Pipe 18
Cbort 7 - Ene_ Llaht-off Above 3300 Rpm with Prime 20
Chart 8 Low Horsepower (Filel Flow Low)
Cbort 9 Low Horaepower (Fuel Flow High) 24
Cbort 10 Rpm Cycllnamp or No indication 25
Cbort 11 - Hih Horaepower (Fuel Flow RIhl or Power Lever Advanced to AHen Tt T with Other Enlin 26
Cbort 12 Power Lever Muat Be Retarded to Allen Tl T with Other Enelne 28
Cbort 13 T 1 T Hlh Low Cycllne or No indication 30
Cbort 14 - Fuel BOOBt Pump Pressure Warnlnamp Wbt Abnormally On 31
Chart 15 Oil Temperature Out of Limits or No Indication 32
Chart 16 HorsepOwer HIb Low CycUnc or No Indication 33
Cbort 17 Bela Llht OUt (Taxi) or Beta LIht On (FIlht) 34
Chart 18 Prop Blades Do Not Move Toward Feather On Auto-feather Check 35
Chart 19 Prop Blades Do Not Move Toward Feather on Auto-feather Cbeck 36
Chart 20 - Prop Blades Do Not Move Toward Feather on Auto-feather Check 38
TABLE OF CONTENTS (Cont)
CIIart II bull _ et1 G on P Out of Llmltl or Suddn SbUt of SI) PSI or M 40
CIIart 23 bull R_ell G 011 Pre FluetuatlDf 4J
CIIart IT Ule to Hold Low Rpm on No 4 EJgtc1De 50
CIIart n - PU amplid RG 011 Pr Out of Limit Slmltillleouty 44
CIIart 24 LoI of _u~lloo Gear 011 P amplid Rpm 46
CIIart 26 - Pow Lever Cot be ReUrded Below Fllchl Idle 48
CIIart 18 - Unable to Sele~t Lo Rpm 49
GIIar1 28 - No PrIm el PIImp Fallu LIcht OurlDf Start 51
CIIart 29 - TI T AboYe LImit Ourlnc start 52
Chart 30 - Hlfh TI T at Low Rpm 54
CIIart 31 ExI Z1De 011 C pt1 56
Chart 3J bull HllhSabllixed TI T at Take-off Power 59
Chart 33 - Low stabUiad Tl T at Take-off Power 61
Chart 34 Engine Compreaaor Surge 63
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
TABLE OF CONTENTS (Cont)
CIIart II bull _ et1 G on P Out of Llmltl or Suddn SbUt of SI) PSI or M 40
CIIart 23 bull R_ell G 011 Pre FluetuatlDf 4J
CIIart IT Ule to Hold Low Rpm on No 4 EJgtc1De 50
CIIart n - PU amplid RG 011 Pr Out of Limit Slmltillleouty 44
CIIart 24 LoI of _u~lloo Gear 011 P amplid Rpm 46
CIIart 26 - Pow Lever Cot be ReUrded Below Fllchl Idle 48
CIIart 18 - Unable to Sele~t Lo Rpm 49
GIIar1 28 - No PrIm el PIImp Fallu LIcht OurlDf Start 51
CIIart 29 - TI T AboYe LImit Ourlnc start 52
Chart 30 - Hlfh TI T at Low Rpm 54
CIIart 31 ExI Z1De 011 C pt1 56
Chart 3J bull HllhSabllixed TI T at Take-off Power 59
Chart 33 - Low stabUiad Tl T at Take-off Power 61
Chart 34 Engine Compreaaor Surge 63
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Introduction to Trouble Shooting
Tip Charts It
In preparation of the following H tip charts l two basic assumptions are made t the flight crew has followed the correct operating procedure and (2) the problem is caused by a single failure or malfunction
Each chart is organized in five sections situation~ conditions cockpit indications ntost probable area and probable causes
The Situation is the main point of the problem as Isquawked by the flight crew
The Conditione are the characteristics ot the selected engine operation at the time ~ation
The Cockpit Indications are those indications which ntuet be noted at the time the situation occurs in order to fully define the problem and thereby make one specific chart appUcable These indications are necessary to select the optimum starting point for trouble shooting
The Most Probable Area is the area (engine propellerraquo or aircraft and QEC) which contain components most applicable to the problem
The Probable Causes include the components in each area which can possishybly cause the problem
Each tip chart II is applicable to a specific type of problem There will be situations encountered for which there is no applicable chart but the methods and principles used on the Htip charts1 are effective in all maintenance problems
The 1tip chart811 will be effective if certain basic rules are observed
1 Obtain as much information as possible from the flight crew and their write-up In many cases this information will define the problem comshypletely and eliminate the need for an engine run-up
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
2 Use the tip chart a check list and follow the numerical Qrder of the chart down to the Moat Probable Area Make special note of each coekpit indication in order to avoid uaing a tip chartgt which is not applicable to the problem
3 ProcHd to the section under Probable Causee which correeponds to the area liated under Most Probable Area On mOlt 01 the tip charts a brief discussion or the cockpit indications i8 included to e~lain the reasoning ueed in selecting the Most Probable Area If investigation ot the most probable area reveals no abnormal conditions proceed to the other two areas
4 When checking a given component be aure to read all applicable tootshynotee
Aa 118 true with any trouble shooting information these charts are dependent upon the engine and aircralt indicatinc eystems and therefore caution must be exerciaed to avoid trouble ahooting difUcuHiea cauaed by lalse indications In most casel a false indication may be detected by checki it against the other indicationa for that englne For example a TIT indiCating aystem malfunction ahould be euapeeted It the TIT ie bigh low or cycling with no change in fuel flow andor horaepuwer In the case of the primary Cuel pump failure light whlch is used to indicate fuel pump paralleling on a start the prelsure switch setting may shift and not energite the light when the pumpI are operatinc in parallel the pump pertormance may be Sluggish or the paralleliti valve may mtJfuncHon
For this reason the Ught may be relied upon only if it comes ON between 2200 and 9000 RPM definitely indicatinc normal parallel pump operiHion l the light is OFF it may be any one ot the above malfunction Similarly the fuel boost pump pressure light is reliable only if it is OFF If the light i8 ON indicating that the pressure riee aCTOBS the engine driven boost pump is below the 18 psi lImit the reason may be a pressure switch letting shifL
The ollowrni abbreviations and symbols are used in the tip chartl
T1T Turbine Inlet Temperature o to tZOOmiddotC HP To~quemeter Horsepower at 13820 RPM -1000 to 5500 HP RPM Reductjon Gear Pinion Shaft Speed o to 16000 RPM FIF Fuel Manifold Fuel Flow 500 to 2500 Iblhr PFPF Primary Fuel Pump -Failure Light on when pri shy
mary pump presshysure eceeds 150 PSI
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
FBPP Low Fuel Boost Pump Pressure Light on below 18 PSI
ROOP Reduction Gear Oil Presure o to 300 PSI PUOP - Power Unit au Pressure o to 100 PSI LOP - Low Oil Pressure Light on below
(l30 PSI (RG)
I gt (50 PSI (PU)
OIT - OU Inlet Temperature -50 to 150C EOQ Engine Oil Quantity o to a galgt Vib - T - Turbine Vibration Applicable only to o to 5 mils
g (High Frequency) operators hBeving
Vib P - Propeller Vibration vibration monitoring 0 to 40 mils (Low Frequency) equipment
- Indicator Light
bull Indicating Light ON
- Indicator Light OFF
Q I- Pointer to Indicate Important Item
Cockpit indicator face showing approximate reading
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
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Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 1 Trouble Shootln
lInl
2 Starlin LowTIT
1 RPM StnaU WIth 3 Power Lover - START Prhner Ye
Coekell InlllbullbulltloNl
5 Below 75OC 7 Light ON0 ~ PFPFTIT
6 Botwean 3500-amp500 e LlhtOFF And Not Inclq(id bullFBP
Mot Probable Area 9 Enlne
RPM etagnation with low T I T IllUggestl the engine i Iowan power dJe to fuel Itar-vtian
Probable Caule
10 Enline
nmaged Turbtne--It is recommended that a borecope inap4ction be made to deter-rome turbine condition beCore fuel system component are investigated or changed
_b) Temperature Adjustment Box (tart limit settin or shiftbullbull caueing take condition)
(c) T D Vlv~ (motor bindin in take mechanical null orifiee bullbullttin too lean
(d) Fuel Control starting schedule 8hifted lean (U aneroid bellow (2) ruel temperature compensating bellows) Compre80r presure sensing probe restnction
---(e) T D Control (tart limit settinl or hift bullbull causinll take condition) (0 Fuel Control Cutoff Actuator (partially closed)
-(g) Mamfold Drtp Valve (mechanical blnding or open coil)
COllt)
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
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ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(h) Low Pressure Fuel Fllter (iced t H) High Pressure Fuel Filter (iced t ) (j) Coordlllator-to-Fuel Control1inkage (cutoff valve linkage rigging) (k) Power Unit Wiring Harness RH (lead to drip valve or TD valve) (1) Power Unit Wiring Harnes~ LH lead to fuel control Shutoff actuator
11 Propeller
Not applicable
12 Aireraft
lt) QEC (firewall) Fuel Cutoff Valve (partially closed) (b) Combustor (abnormal fuel usage loqae fuel line connection) (c) Fuel Heater (iced A or restricted)
Fuelmiddotboost pump pressure warl1lnglight ahCJlld be on~ Indicated temperature cut back to alower value than 830middotC
A Not if engine oil temperature is 40 to tOO-C
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
bullbull bull
Chart 2 Trouble Shoot
Condm
1 ilpm S_tton With 2 Start High TIT 3 Power Lever - START
4 Primer - Yeo
Cockpltlndlcato
5 IUdina 830C Start 7 ~ Lipt ON0 Llpit Abou PFPF
Be_n 3500-amp500 8 Light OFF And Not Increi FBPP
TLT
(RPM IBtacnation with high T t T augelta the engine has been forced into a compreBSOT stall condition by an explosive light-off or a rich starting fuel schedule or the encine i8 experiencinl air starvaUon)
Probable Cause
10 Engine
NOTE An explosive 11ght -oft due to the ule of prime on -- 9 hot engine can cause rpm tagnaUon with high T LT
(a) Spark lInltero (weak park cau81ng more explote light-ofl) (bl Speed Senome Control (low actuation of tho 2200 rpm witch
caulna late and consequently more explosive light-off) (c) TO Control (malfunction of limiter bullbullIoctor relay d _t limit
oeUlng hillh) (d) Temperaturo Adjuotment Box (trt limit bullbullltllljl hlp) (e) Coordlnllor-lo-Propeller LloIt (mirlgged or brok~n caulng high
hlade angle (f) Fu1 Control (tarllng ochedulo hitted rich inlet temperature
compenaaUnl bellow) (I) Compror (011 cooted blade foreign objct damage)
(conI)
10
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(h) 5th or 10th Stage Bleed Valves (stuck closed due to oil coking or broken piston rings)
(1) Turbine (overtemperature or foreign object damage) (j) AI Inlet Obstruction (k) Speed Sensitive Valve (holding bleed valves closed) (1) TO Valve (stuck in put position slow response mechanical nun
oritice setting too rich) (m) Ignition Exciter (weak spark causing more explosive light~off) (n) Power Unit Wiring Harness LH (lead to speed sensitive control
fuel control cutoff actuatorJ primer system pressure switch) (0) Primer System Pressure Switch (pressure setting shift causing exshy
cessive prime flow) (p) Power Unit Wiring Harness RH (lead to primer system valve) (q) Primer System Valve (partially open) ~ (r) ThreeWay Elbow Valve (stuck closed valve located at TO valve
bypass)
11 Propelle
(a) Hydraulic Governor (mechanical failure wrth resultant blade angle shift from minimum torque position)
(b) Beta Feedback Shaft or Drive Gear Assembly (mechanical failure with resultant blade angle shift from minimum torque position)
(c) Governor Carriage Assembly (mechanical failure with resultant blade angle shift from minimum torque positlon)
12 Aircatt
(a) StaNe AI Supply (low pressure) (b) Starter (cutout below 8000 rpm) (c) Inducer Valve (stuck open on more than one engine) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (mafunctioning) (f) 14th Stage Check Valve (one valve swck closed on engine supplying
the air) (gl Aircraft Engine Control Linkage (misrigged causing high propeller
blade angle) (h) Engine and Inlet Duct Anti-icing (switch or wiring causing open
circuit on more than one engine) () Alrcaft Deleing (bleed system on) (j) Firewall Air Shutoff Valve (partially open)
II
w
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Cockpit Indications
4 With Rpm 7 With Rpmeuro5 (sect TIT FF
5 With Rpm 8 Light orr~ bull HP FBPP
6 Over t 15euro) RPM
NOTE
Symptoms atlll exist after (1) Going to SYNC OFF and (2) pulling out the propeller solenoid valve circuit breaker~
Depending on the rate of cycling the T t T and F IF may be of lesser magnitude
AIrcraft ruel systemcan give an erratic ruel inlet supply but thIS should be mdicated by FBPP hght nickering
Most Probable Area
9 PropellerEngine
(The propeller hydraulic system may be hunting or the engine fuel system rnay be unatable)
Probable Causes 10 Engine
(a)
(b) (d
T D Control (high unbalance voltage~ high gain erratic variable phase voltage) Speed Sensitive Valve (centrllugal weight system hysteresis) Fuel Control (governor spring railure speed system Shirt)
(cont)
12
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(d) T O Valve (rupture of regulator valve diaphragm~ erratic deviation from 400 cycles partially seized bearings mechanical misalignment of Ieduction gear unit~ erratic open or short in the geneIator damping ciIcuit)
(e) Coordinator Control (erratic short in potentiometer eIratic operation of 65 degIee switch)
(n Speed Sensitive Control (erratic operation of 13000 rpm switch should not cycle belo B6Se power lever position 9000 rpm switch cycling causing fuel pump paralleling)
(g) Coordinator-to-Fuel Control Linkage (woIn rod end or misrigged) (h) Thermocouple Terminal Block (amplifier circuit leads touching
together cyling or short to ground cycling) (1) Temperature Adjustment Box (erratic circuit in the Bias or Slope
potentiometer (J) Thermocouple Harness (amplifier circuit short-to~ground cycling) (k) Coordinator Mounting Bracket (broken) (1) Power Unit Wiring Harness-LH (erratic circuitry to speed sensitive
control or coordinator switches) -RH (erratic circuitry to T D valve motor)
(m) Thermocouple (amplifier circuit erratic 8hort~to-ground) (n) Fuel Pump Paralleling Valve (mechanical failure resalting in valve
cycling due to vibration)
bull Temperature Datum System to NULL should stop cycling
11 Propeller
(a) Hydraulic Governor (sluggish speed piston or cyclinder sluggish distributor element governor piston)
(b) Rotary Actuator (intermittent centering circuits)
12 Aircraft
(al Aircraft Deice System i~cllng ON and OFF) (b) Engine and Inlet Duct Anti-icing (cycling ON and OFF) (c) Aircraft Engine Control Linkage (worn or misrigged) (d) Prop Rotary Actuator Wiring (cycling) (e) Combustor (fuel leakage thru check valve) (f) Regulating Valve cyclic leakage)
13
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 4~ Trouble Shooling
1 Uling Prime Engine Doel Not 2 Starting Light-ot at All or Doe Lightshy 3 Power Lever START off Above 3300 RPM 4 Primer Seleoted - Ybullbull
Cockpit Indications
5 0 TIT
No TorTo Increase From Ambient
8 bull FBPP
Light OFF
6 0 RPM
Above 2200
rM 70 V
FF Below 500 (Momentary peak of 800- UOO indicated normal prime was obtained)
Moat Probable Area 9 Engine
(The cockpit indications showed that the apeed eensitive control and the ignition re)Q3 functioned properly and that the fuel aupply tbrouh the fuel control was normel)
Probable Cauaea
10 Engine
(a) TemperatuN Datum Valve (null orifice adjustment) (b) Spar~ Ignitero (weak Or nO spark) (c J Manifold Drip Valve (sticking open indicated by fuel spewing (rom
overboard drain) (d) Fuel Nozzles (obnormal apray pattern (e) Ignition EXCiter (weak or no spark) (0 Spark Igniter Lead (opeQ circuit or short to ground)
(cont)
14
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Propeller
Nat applicable
12 Aircraft
Not apphcable
15
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 5 Trouble ShOOting
Situation Conditions
I Engine Does Not Light-ort Using Prime With Fuel Fog From Engine Tail Pipe
2 3 4
Starting Power Lever START Primer Seleltted Yes
Cockpit Indications
ni No T 1 T Increase 8 0 See Below5 V From Ambient PFPF
~T 9 Light OFFbull6 )I Above 2200 FBPP
RPM
Il()7 Below 500 (Did not peak to 800 1200 indicating that normal r(F prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indications show that either the engine fuel system or the ignition system has malfunctioned)
Probable Causes
11 Engine
(a) Speed Sensitive Control (9000-RPM switch open or setting shifted) gt
(b) Ignition Relay (open ooU) (d Primer Fuel Pressure Switch (electrical discontinuity pressure
calibration shift) (d) Primer Valve (electrical discontinuity plunger stuck closed) (e) Relay Box - Engine Primer Control Relay (open coil stuck de-enershy
gized position) (f) Power Unit Wiring Harness LH (speed control lead open pressure
switch lead open ignition relay lead open) RH (primer valve lead open)
(g) Fuel Cutoff (mechanical shutoff valve sticking partially closed)
Not applicable If the PFPF light ill ON
(oont)
16
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
12 Propeller
Not Applicable
13 Aircraft
(a) Primer Control Relay (open clrcuit) (b) Primer Switch and Wiring (open circuit) (c) Flowmeter (internal restriction reducing fuel supply to the fuel nozzles)
17
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Cbart 6 Trouble Shooting
Sttuatlon ~ I Enpne Doe Not Light-off 2 starting
Ulng Prime With No Foel 3 Po r Lever - START Fog From Enjine Taliplpe 4 Primer Selected - Yes
Coclcplt Indlcatl
5 NoTlTlncreaa S 0 See below0 From Ambient PFPF TLT
9 Light OFFbull6 Above 2200 FBPP~ 7 -cr BelOW 500 (Dld not peak to 800-1200 Indicatln thet normal
FF prime was not obtained )
Most Probable Area 10 Engine
(The cockpit indication ahow a fuel iIIytern maIfllnction)
P rob_hIe Cauaea
11 Engine
a Speed Sensitive Control (2200 RPM wltch sticking or ottlng hifted) (b) Fuel Pump (main heft faUure shy(c) Fuel Control Cutoff Actuator (electrical malfunction in cla-ed poltlon) (d) Coordinator-ta-Fuel Control Linkage (rod end faUure) (e) Power Unit Wiring Harnes LH (speed control lead open fuel control
cutoff-leed open) (t) Fuel Control (mechanl(al shutoff valve sUcking closed)
Not applicable if the PFPF I1ght Ia ON FBPP hould be ON
12 Propeller
Not Applicable
(cont)
18
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
13 Aircraft
(a) Fuel and Ignition Switch and WIring (closed circuit) (b) Feather Button and Wiring (closed cIrcuit)
Not applicable if the PFPF light is ON
19
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Cbart 7 T ble
~
1 EIlfIne JJcbW-A_ _ RPM Oalatl Prima
2 I 4
IIaltiItC Power lAr - STAItT Primer S_ted shy Ya
s No T I T mere JIIht ON (-7- 0lt3 F- Ambient UaW Until En JJcbW-off) TLT
3300 RPM 0 A_ P1PP
I A_ 3300 9 IJcbt OPT JIIIpp
Q bull 7tL~ Below 500 (DId not puk tD 100-1100 at 2100 RPM
Ill mdla_tIDe tbat u ~ __ not IIbtaJae4 I
MOilt P_Afta 10 EnIIMlAte upt___te __4 _ _I arich ttIq IIhIft
primer ~m~ I P_IotCa__
11 EIlfIne
(al 9pHd _Wn COIIlrol (witeh -latl 111111 (bl Primer I P 8_1i (e_trlllal dlIIeontlllultr p
eal1bretiaa blft) (c) Primer V (elAlctlllcal~ plllnpr _tuck el_4) hI) ltalot) B Ilftllzut Primer COlIt lltala7 (_a cotJ 0I1ICJr deshy
rlUl pMtun)() P_r UIlU Wltiqlta- 1lI (p___Ill lUI
(primal _ -_I U PrPP upt 0 CRt at tba tim til uatot- UId tba IUM Ie bIth 11 mdlaa_ that tba opee4 Wn e_lle not fIIIIctIoIdnc at _ correct RPM
20
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
13 Alrcnatt
(al Alrcnatt Primer Control Rei17 (open circuit) (b) Alrcnatt Primer Swllch ampAd Wirln( (open circuit)
21
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
L
Chart 8 Trouble Shooting
2 Takeoff or Climb or CruiseLowHorlepower (FF Low) 3~ Power Lever Per Condition
0 CockpIt Indication
4 Normal 6 bull Normal 8TIT RPM
gtTakeoCf (At Least 3005
0shy0 Low)
HP Cl1mb Crute at middotLow7Leut 150 Low) FIF
A compared to other engines
Moat Probable Area S Enp
(Low FF and HP willi normal TI T indicate Ia_ normal aU- flow to Ihe Wrblne )
Probable Cauee
9 ElIIn
a) Comprbullbullaor (F O Dbull dirty rubbed Called) (1)) Speed Senitt Valve (air Input hobullbull failed bearlnJ _heared shatt)
Lo of approx 1300 hp (c) Anti-icing Solenoid Valve (valve malfunction eticking solenoid open
circuit) Lo of appro 140 hp (II) 5111 10111 5t Bleed Valve (broken hoa awclt openl-one 5th
t-Iobullbull of approx 85 hp One 10111 -lOll - 10 of appro 330 hp
I) Inlet Obstruction Ul Anti-Icing Air Valve (otlcldn pis_) Lou of approx 70 hp I) 14th 5lOlle Comprr Bleed Valve (contaminated with walnut 1Iul1
sUcltl) Lou of approx 425 hp (h) Compressor Bleell Valv Control Valve (UcltlnJ)
10 Propeller
(a) Not applicable (cont)
22
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Aircraft
(a Aircraft De-lee System (system operating indicated by leading edge wing overheat warning light)
(b) Inducer Valve (sticking p~ate valve faulty clutch planet gears torn up) Loss of approx 130 hp -
(c) inlet Duct Anti-icing (sol~noid valve failure) Loss of approx 2~ hp -
23
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 9 Trouble Shooting
Situation Condition
1 Low Hor_r lFIF High) 2 Talce-olI Climb or Crulee 3 Powe Lever - Per Conditton
Cockpit Indication lIN
High0 7EJ TlT FlY
Talceott (At Leut B ~ Pobullbulllbly Above 2 5 ml 350 Lo) Climb amp VlBR-T Crui (At Let 150 Low)
RPM -Aa compared to other engines
M04It Probable Area 9 Engine
Low HP and high FF with normal T I T lndlcatea a decreue in turbine efficiency or combustion ection damage
Probable Cause
10 EngIne
(a) Investigate following areas with Borescope Reterelce Maintenance Manual 12-1 () Maintenance Practices paragraph 1 A
(I) TUrbine Blade (Y O Dbull eroded)
(2) Combustion Uners (over1emperature damalle)
l31 TUrbine Vanea (FODbull eroded)
I Propeller
Not Applicable
12 Aircraft
Not Applicable
~
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
1 RPM
0 Cockpit lndications
4 Normal Cycling Over plusmn75 or6middot8TIT Reads Zero
( RPM 5 Normal
HP 7 Normal FIF cr
As compared to othe r engines
Most Probable Area 8 Aircraft
(Cycling RPM with 00 change io HP FiF or Tl T indicates propeller operashytion was normal and that the indicating system has malfunctioned )
Probable Causes --- shy
9 Engme
(a) Reduction Gear Tachometer Drive (drive spline wear drive gear or bearing damage)
10 Propeller
Sot Applicable
11 Aircraft
(a) Tach Generator (shaft failure open Jindings) bl Tach Indicator (mechanical binding eleclncal malfunction)
25
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 11 Trouble Shooting
Situation
1 High Horspor (F IF High) or P()1IJer Lever Advanced to AUgn T Tith other Engines
2
3
Cruiafshy
Power Lever - Set to Crulse T I T
Cockpit Indications
r 0 Normal 7 lt) High (corresponde to TIT FF HP)
c)Hu incred 100 HP 8 Below 2~ 5 mils or more per T L T VIBRmiddotT during engine TOO per engine performance ehut
6 Normalmiddot RPM
~ compared to other enines
MOIl Probampble Area 9 Engln
H1gh horepawer and hiFt fuel now with normal indicated turbine inlet tempershytun tluggeets a fae T I T lIipal from the temperature Buaing ayetem z to both rnpUfier and indicator
Probable Cauaes
1Il Engln
(a Thermocouple (detective thermocouples) (b) Tbermoeouple Harnebullbull (hort to ground or 1008 connections on indishy
cator aide) (e) Thermocouple Harnebullbull Terminal Block (ahort to groond or loolJe conshy
nection on indicator alde)
NOTE See MaIntce M_I Sect 71-11-0 and 77-11-1 Maintnanc Practlcbullbull lDapeclionCbeck for 1atlptIOli procedur for ampbon cauetI (eont)
26
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Propeller
(a) Not applicable
12 Aircraft
(a) T I T Indicator (internal malfunction loose harness connection) (b) Terminal Block to T 1 T Indicator Harness (short to ground loose
connection)
NOTE If investigation of all the above causes does not reveal the source of the problem it is possible that the thermocouples haveexperishyenced a shift in calibration due to temperature damage If this is suspected replace all thermocouples
27
w
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
ConditionSituation
2~ Cruiae To Allgn T T With Other Eqlneo
1 Power tver Must Be Retarded
3 Power Lever - Set to Cruie T I T
COCkpit IndlcoUOM
1 1 4 ltI Set with power lever 7 V Per TI T
TIT FIF
c)Hu Incred 100 HP B Below 2 5 mila
HP or more durin engine VlBR-T TOO per engine pershyformance chart
5 0
o6 RPM
bull As compared to other eninti
Most Probable Area 9 Engine
If the power lner muet be retarded to schedule T t T to the other engine there i8 bull malfunction in the electronic fuel Iyetern or the power lever ia milshyrilfredbullmiddot
Probable Cause
10 Enlline
() Thermocouples (open junctions on control aide) (b) Thermocouple Harnebullbullbullahort to around in both chromel and alumel
circuits or loeae connectiona 011 control lide (c) Thermocouple Harnebullbull Terminal Block (ahort to ground in both
chromel and alumel circuit or 1001 connection on control aide)
JfOTJ See MoInten Manu1 Secll 77-11-0 IIIId 77-11-1 MoIntenshye Practices tnopectlonChck for _ bullbulltlltlen procedure for aboYe eme
(conll
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(dl T D Control (maladjusted o~ internal malfunction) (el Coordinator malfunction or misriggedl
11 Propeller
(al Not Applicable
12 Aircraft
(al Terminal Block to T 1 T Control Harness (short to ground on both chromel and alumel circuits loose connections)
NOTE If investigation of all the above does not reveal the source of the problem it is recommended that all thermocouples be replaced
29
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 13 Trouble Shooting
1 TI T HlIfh Low Cycling 2 General or No Indication
Cockpit Indicationa
3 bull High Low Cy- ~ NormalG)cling or No lndtshycation
0 0
TIT RPM
4 Norrnal 6 Normal0 0 GOO HP FF
As compared to oilier engines
Most Probable Area
7 Aircraft
Probable Causes
8 Engine
(a) Thermocouple Terminal Blodt (open circuit abort to ground) (b) Thermocouple Harnes (short to ground open circuit) Cd Thermocouple (short to ground more than three (3) open ltircuits)
9 Propeller
Not Applicable
10 Aircraft
(al T I T lndicator (malfunction) (b) Wiring and Connectors (c) Turbine Inlet Temperature lndlcator Circuit Breaker (malfunction)
30
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 14 Trouble
Cockpit Indications
Light ON During Start and During Engine Operation
FBPP
Most Probable Area
4- Aircraft
Probable Causes
5 Engine
a) Engine Fuel Pump (boost element drive shaft failure) (b) Low Pressure Fuel Filter (iced or contaminated)
6 Propeller
Not Applicable
1 Aircraft
(6-) Boost Pump Pressure Switch (pressure setting shift or switch malshyfunction)
(b) Aircraft Boost Pump (pump OFFl or malfunction) (e) Normal Fuel Shutoff Valve (partially closed) (d) Emergency Fuel Shutoff Valve (partially closed) (e) Fuel Heater Uced restricted overheating fuel)
Not Applicable If Engine Oil Temperature is Aoove 40C
31
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 1S Trouble ShooUq
~
1 Oil Temperature OJt of 2 Ground or Fllaht Operation Limit or No Indication
Cockpit indication
3 K Inllaht - Above 100 - Below 80
On round shy Above 100V OIT
5bull Llht OFF
LOP
Moat Probable Area
6 Aircraft
Probable Causes
7 Engine
Not Applicable
8 Propeller
Not Applicable
9 Aircraft
Cal 011 Cooler Flap Actuator (stuck cloaed) (b) Inducer Valve (stuck cloed) (c) OU Temperature Sensing Element (malfunction) (d) 011 Temperature indicator Cmalfunctlon) Ce) 011 Cooler Inlet Duct Cblocked)
32
~
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
l
CockEit Indications
~ Normal 6 NormalC) 0
TLT HPM
S High Low Cycling 7 (j NormalQ or No Indication HP FiF
As compared to other engines
8
9 Engine
fa) Phase Detector (calmiddot A or cal-B setting shift no output) (b) Horsepower Indlcator (shift in calibration) (d Torquemeter Pickup (open cIrcuit pins A-B or C-D) (d) Torquemeter Shaft Assembly (excessive whip due to out of balance
resulting in rubbed pickup poles) 10 Propeller
Not applic able
11 Aircraft
(a) Wiring and Connectors (pickup to phase detector phase detector to indicator power supply)
33
~
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
L
Chart 17 Trouble Shootin
Beta Light Out (Taxi Range) or 2 General Bela Light On (Flight Range)
Cockpit Indications
3 Per Conditions
Most Probable Area
4 Propeller
Probable Causes
5 Engine
(a) Coordinator-to-Propeller Linkage (bolt ttlisamping broken rod end misrigged) +
6 Propeller
(a) Blade Angle (Beta) Switch (misrigged switch malfunction) + (b) Brush Block (short to ground) (cj Electrical Connector or Wiring (short to ground) (d) Advisory Lights Circuit Breaker Out of the Circuit
7 Aircraft
(a) Aircraft Engine Power Lever Linkage (bolt missing broken rod end misrigged) +
(b) Beta Light (test circuit sWltch malfunction) + (c) Beta Light Bulb (burned outl
NOTE Causes beta light to go out or remain out + Causes beta light to go ON or remain ON
34
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart la Trouble
4 Cockpit Indications
Indicator Llght in Feather Switch OFF
5 Feather switch pulls IN when power lever is advanced to TAKEOFF but light in SWitch does not come ON
6 Auto Feather Arming Light ON
(If the feather switch pulls INn but the feather switch light does oot come ON~ the malfunction i6 in the feather pump motor power supply or its control circuit )
Probable Causes
a Engine
(a) Not Applicable
9 Propeller
(a) lime Delay Relay-Feather (open or malfunction)
10 Aircraft
Ca) Feather Pump Motor Circuit Breaker (open)
(b) Feather Pump Motor Relay (open coil or contacts)
d Feather Switch Copen circuit to feather pump motor relay)
(d) Feather Pump Motor Power Supply
35
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 19 Trouble Shooting
Situation Conditions
2 Ground Check (Static) Toward Feather On Autoshyfeather Check
1 Propeller Blades Do Not Move
3 Power Lever - TAKEOFF
Cockpit Indications
4 Indicator Light in Feather Switch Off
5 Feather Switch does not pull IN when power lever i8 advBJlced to TAKEOFF
6 -cent- Auto Feather Arming Llght may be on
Most Probable Area 7 Aircraft
(Failure of the feather switch to pull IN1 suggests a malfunction in the circuit to the feather switch actuating coil through the auto-feather relay contacts or in the circuit to the auto feather relay from the auto feather middotcircuit breaker )
8 Engine
(a) Thrust Sensitive Switch (both micro switches open connector piru or wiring open)
(b) Reduction Gear (TSS plunger actuating arm broken)
9 Propeller
(a) Not Applicable
(coot)
36
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
10 Aircraft
a) Auto Feather Circuit Breaker (open)
(b) Auto Feather Arming Switch Of (one contact open
(c) Auto Feather Relay (open) (check auto-feather relays on all engines)
(d) Power Lever Quadrant Switch (malfunction)
(e) Auto Feather lnter~locking Contacts (subject engine contact open on one of other 3 feather switches)
(f) Feather Switch (actuating coil open)
(g) Aircraft Wiring for above components (open or shorted)
Not Applicable II Auto Feather Arming Light 1 ON
37
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 20 Trouble Shooting
Situation Conditions
1 Propeller Blades Do Not Move 2 Ground Check (Static) Toward Feather On Auto-feather 3 Power Lever - TAKEOFF Check
Cockpit Indications
4A Indicator Light in FeatheT Switch ON-yshy
5 cent- Auto Feather Arming Light ON
(If the feather switch light is ON the power circuit to the feather pump motor ie closed and therefore the malfunction is probably in the propeller feather system )
Probable Causes
7 Engine
(a) Feather Solenoid (winding open plunger binding connector pins or wiring open)
(b) NTS and Feather Solenoid to Propeller Linkage (bolt missing rod end worn)
(c) NTS Actuator (bin~ing pivot arm)
8 Propeller
(a) Low Oil Level
(b) Brushes (contaminated or dirty)
(c) NTS - Feather Valve (malfunction)
(d) Feather Pump Motor (malfunction)
(cont)
38
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(el Connector Pins (open)
(0 Regulator Adapter Stop (worn ~ausing out of rig condition)
9 Aircraft
(a) Feather Solenoid Relay (open)
(b) Feather Circuit Breaker (open)
(c) Wiring (open or shorted)
39
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 21 Trouble Shooting
Situation Conditions
1 Reduction Gear Oil Pressure out of Limits or Sudden Shift of 30 PSI or More
2 Taxi Take-off Climb or Cruise
Cockpit Indications
3 Low rpm - Below 50 5 60 - 100Q) 0All Other ~ Above 240 RGOP Below 130 OIT
6 6 - 8 (EOQ below S[) indicateB oil leakage or 4 SO - 7S EOQ consumption)8
PUOP 7 Light may b ON0 LOP
Most Probable Area 8 Engine
The reduction gear has a fixed orifice oil system The problems described above are usually caused by a change in the effective orifice or the pump output
Probable Causes
9 Engine
(a) Reduction Gear Oil Pump Assembly (pressure element deterioratedA check valve stuck or restricted4 )
(b) Reduction Gear Oil Pump Drive Train (bearing or gear failure 4 ) c Reduction Gear Internal Oil Passages (blocked or ruptured4 worn
transfer tubes A ) d Oil System Air Lock (loosen filter and motor engine4 ) (e) Reduction Gear Pressure Relief Valve (stuck open 4)
(cont)
40
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
10 Propeller
Not Applicable
11 Aircraft
(a) OU Prebullbullure Indicator (malfunctionA) Check with direct read1namp 0) 011 PreINTe TraMmltter (malfunctlonA) late at reduction ear
prelNre lena port (e) 011 LUw (coUa_d or reatrlcted) (d) 011 Tank PrelUrloq Val (proouro lettinf hlh or tuck doed)
Should le accomprued by bull cornapondinl power unit oil prebullbullure cIwIp
bull hilb prealllre llow prelNrbull
~
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 22 Trouble Shooting
2 Taxi Take -Off Climb or Crul1 Reduction Gear all Pressure Fluctuating
(anie Exceed 40 PSll
Cockpit Indication
3 euroJ Fluctuating More Than 40 PSI anie
8 6) 8 - 8 (EOQ below 5 Inshydicatea leakage or con
ROOP EOQ sumption and may cauae
4 EJ PUOP
Stable 50 - 75
87
fluctuation)
GO - 100
OIT 5 C) I4ht May Be Fl1ckerln
LOP
Moat Prooble Area 8 Aircraft
Reduction Gear au Preaaure Fluctuation is usually cauaed by aircraft oil aya tern aeration or changes in pump inlet presaure
Probable Cauaes
9 Enclne
ltal Reduction Gear au Pump Asaembly (erratic filter bypass valve presshyaure element deteriorated)
(b) Reduction Gear Presaure ReHef Valve (erratic)
10 Propeller
Not Applicable
(cont)
42
~
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Alrcrait
(a) Reduction Oe Oil Prure Indicator (mallllnction)ICheclr with direct (b) _uction Oear Oil Preure Transmitter reading goge nt
(mallllnction) RIG prebullbullure (c) Oil Line (collaped or r trlcted) eonolng port (d) Oil Tank Preourlzation Valve (prebullbullure
-ttlnC _ted) (eJ Oil Tank Vent LIne (reotrlcted) (f) Enclne Vent LIne (retrlcted)It) Preoure fIeruI1ac LInea to Tranomltter (reotrlcled or entr_d air)
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 23 Trouble Shooting
Situation Conditions
2 General OU Pressure Out of Limits Simultaneously
1 Power Unit And Reduction Gear
Cockpit Indications
Low rpm - Below 50 60 - 850deg 683 RGOP All Other - Above 240 OlT
Below 130
70 More Than 5 EOQ
4 () May Be ON LOP
5 (2)0Above 15 PUOP Below 50
Most Probable Area 8 Aircraft
An out-of-limits condition (high or low) on both power Wlit and reduction gear oil pressure suggests a malfunction of the aircraft oil supply system or the pressure regulating or indicating systems
9
10
Engine
Not Applicable
Propeller
Not Applicable
Probable Causes
(cont)
44
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Aircraft
(a) Oil Tank Preasurizing Valve- (restricted or stuck closed)
(b) Oil Tank Vent Lines Rbullbulltrictedprebullbullurising valve to engine brbullbullther engine brether to drain manitold or manitold overboard line)
(e) 011 Tank Shutot Valve + (malunction io closed position)
(d) Emerency El1jfine Shutdown Reioy + (malfunction reoultnc in 011 Ihulshy011 valve rema1ning clolled when emergency handle ia in
(e) 011 Prebullbullur lndlcalnc powr Supply + (fun blown uaually r bullbullulls in a radual dcre to approxlmtely 130 (RIG) nd ~O (PU)
(0 Riht Hnd Flran Electrical Conneclor + (Pin M circuli abnormal not opnInc 011 bull hutot valv)
biCh pJeesure
+ low preseure
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 24 Trouble Shooting
2 General1 Loss of Reduction Gear Oil Pressure and RPM
Cockpit Indicationstf 3 l) -Normal 8 lt) Light ON
TIT LOP
4 GmiddotPossible Loss of Indication 98 50 to 75
IIf PUOP
S (2) 108 so to 85necreae 10 Zero RPM OIT
i 6 V-J Normal 11 ~ Above 5
FF EOQ
7 0 Decrease to Zero 12 Power Lever Per Condition
RGOP
As compared to other engines
Most Probable Area 13 Engine
14 Engine
(a) Reduction Gear Accessory Drive Train Failure (check by removing tach generator and inspecting drive for rotation when prop is pulled through No rotation calls (or reduction gear removal )
(cont)
46
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
15 Propeller
Not Applicable
16 Aircraft
Not Applicable
7
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 25 Trouble Shoohng
1 Power Lever Can Not Below Fllght Idle Detent
Cockpit Indications
3 Power Lever - raised above detent but can not retard
Most Probable Area 4 Propeller
(The solenoid stop assembly is not retracting when energized or it is not being energized through the aircraft system )
Probable Causes
5 Engine
(a) Coordinator to Fuel Control Linkage (misrigged mechanical binding or jammed by foreign object)
(b) Coordinator to Prop Linkage (misrigged mechanical binding or jammed by foreign object)
(c) Coordinator (internal binding)
6 Propeller
(a) Solenoid Stop misrigged open circuit mechanical binding should be able to override wlth 9 to 12 Ibs pull on power lever
(b) Condition Control Lever (misrigged mechanical binding)
(c) Internal Linkage (mechanical binding)
7 Aircraft
(a) Throttle ~uadrant Switch S-16 (misrigged or faulty contacts not energizing solenoid stop)
(b) Solenoid Stop Circuit Breaker
48
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Cbart 21 Trolbl Shootinll
1 Unable To Selecl Low RPM 2 Tul
Cockpit lnd1caUona
0 Not neerbullbullbullbull 10 10 000 RPM When Low 1 Solcled30 IUN
Mot Probable AI 4 Encin
(The tvel control _rnor t olenold ia nol uncUonIIIC wbon bullbulld or It I _ bel nerod b the alrcraft rt 1 )
Probable C
5 Etne
() Fuel Control Lo_RPM Soloclor SOlld coli oe_eal _ )
(bl power Ulltt Wlrlnf lIarne RII (low-rpm SOlenold lead open Mort to Found)
6 Propoller
Not Allcabia
7 Aircraft
11 Lo-rpm SoIIDOld Circuit Breaker I)
(b) Throttl Qudranl 1-32 Swltcho (
(c) RIJIII ampfIdor 1Aft Hand ~Inf Oear 1Ic_ II_ell ()
(d) Lo-rpm Seleelor Switch ( c1rcuitl
(0) Selor Swllch aol (open circuit)
(f) Low-rp Diaarmlnf RI (open circuli)
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 27 Trouble Shooting
1
Decreases To 10000 When Selected But Will lot Hold3
NOTE middotIn this situation it would also be impossible to select low rpm on engines I 2 and 3
Most Probable Area 4 Engine
In this situation the fuel control reset is working correctly but the interlock and hold circuits on the engine and aircraft are malfunctioning
Probable Causes
5 Engine
(a) Speed Sensitive Control (13 OOO-rpm switch st1ck open)
6 Propeller
(a) Not Applicable
7 Aircraft
(a) No4 Low-rpm Interlock Relay (open coil open contacts)
(b) No 4 Low-rpm Switch Hold Coil (open circuit)
50
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
--------Chart 28 Trouble Shooting
Condition8Situation
1 No Primary Fuel Pump Failure 2 Starting Light During Starting
Cockpit Indications
3 No Light Btn 2200 5 Power Lever ~ START PFPF and 9000 RPM
4 Light OFF FBPP
MOBt Probable Area 6 Engine
1 Engine
(a) Fuel Filter PreS8ure Switch (setting shift or mechanical blndirlg)
(bl Fuel Pump Paralleling Valve (open coli or mechanical binding)
(c) Encine Fuel Pump bull (secondary element drive sheared)
(d) Electrical Harness - RH (parallelq valve lead or preuure itch lead open)
Not applicable if fuel pump bUmp can be felt at 9000 rpm
e Propeller
(a) Not Applicabl
9 Aircraft
(a) Advisory Lights Circuit Breaker No 10 (open)
(b) Primary Fuel Pump Fallure Light (buJMd oul or bad connection)
51
y
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Cockpit Indications 1l0 I~ _~~~d p FiT
61[J0 ~~
3 Above 830degC for 8 6 ~ PossiblyTIT seconds 01 above 965~ FF above normal
Accelerating between 7 Light cOmes ON between V-- 3500 and 10300 PFPF 2200 and 9000 rpm RPM
5 PRIME Selected and obtained 8 No lightbullFBPP
9 Power Lever START
Most Probable Area 10 Engine
The above cockpit indications suggest an abnormal fuelair ratio due to a rich fuel schedule or deficient air flow through the combustion section
Probable- Causes
11 Engine
~OTE If FF appears normal during start fuel system components are satisfactory
(a) Fuel control (starting schedule shift ruptured temperature compensatshying bellows
(b) Temperature Datum Control (start limit setting shift high speed sensishytive slave relay maUunction)
(c) T D+ Valve (stuck in putU position slow response null orifice ad justment too rich)
(d) Temperature Adjustment Box (start limit setting shift high)
(cont)
52
w
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(e) Compressor (dirty foreign object damage) (0 Air Inlet Obstruction (g) Primer Fuel Pressure Switch (pressure setting shift high causing exshy
cessive prime flow) (h) Primer Vslve (stuck psrtially open) (i) Three Way Elbow Valve at TO Valve Bypass (stuck closed) (j) Coordinator to Propeller Linkage (misrigged or broken causing higher
than minimum torque blade angle)
12 Propeller
(a) Hydraulic Governor (malfunction resulting ilrblade angle above minishymum torque position)
(b) Beta Feedback Shaft and Drive Gear (malfunction resulting in blade angle above minimum torque position)
(c) Governor Carriage Assembly (malf~ction resulting in blade angle above minimum torque position)
13 Aircraft and QEC
(a) Starter Air Supply (low pressure) (b) Starter (cutout switch setting shifted low) (c) Inducer Valve (stuck open) (d) Air Pressure Regulating Valve (partially closed) (e) Combustor (no combustion) ~
(f) 14th Stage Check Valve (one valve stuck closed on engine supplying air)
(g) Aircraft Engine Control Linkage (misrigged causing a propeller blade angle above minimum torque position)
(h) Engine and Inlet Duct Anti-icing (circuit malfunction resulting in air bleed from engine)
(0 AircraCt Deicing (circuit malfunction resulting in air bleed Crom engine)
(j) Firewall Air Shutoff Valve (partially closed on engine being started partially open on other engines)
53
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 30 Trouble Shooting
Situation Conditions
I High T I T at Low RPM 2 Taxi - Low RPM
EJ Cockpit IndiCa~ibull 00 3 High 6 High
Tl T
4 ~ Normal 7 m P08sibly High (above~-T 25 mils)
0 0 Bee (a) under engine
5 Normal
RPM As compared to other engines
NOTE Check anti-ice system malfunction by selecting anti-ice on other engmes and comparing T 1 T and F IF with questionable engine
Most Probable Area 8 Engine
High TolTo and FF at low rpm suggests that the fuel control is forced to a rich schedule in order to maintain rpm This could be caused by a 10S8 of turbine efficiency or a-low air flow through the engine
Probable Causes
Engine9 0
(a) Turbine (mechanical damage or deterioration this would probably cause slow acceleration during start)
(b) Inducer Valve (stuck in open position excessive leakage faulty clutch planet gear damage valve to motor linkage faulty)
(c) 14th Staoge Compressor Bleed Control Valve (piston binding in closed position allowing bleed valve to be open after starting)
(d) 14th Stage Compressor Bleed Valve (valve seat damaged and leaking or piston rings leaking resulting valve being open after starting)
(e) Anti-icing Solenoid Valve (open circuit or valve leaking) (1) Anti-icing Air Valve (leaking)
(cont)
54
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
10 Propeller
(a) Not appllcable
11 Aircraft
Ca) Inlet Duct Anti-icing Solenoid Valve (open circuit or valve leakinr) (b) Aircraft De-ice Systembullbull (malfunction resulting is air bleed from
engIne)
Thermal indicators should be on
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 31 Trouble ShootinC
Situation Conditions
1 Excessive Engine Oil Consumption 2 General (More than O 7 galhr)
Cockpit Indicationslt
3 0 May Be Cycling 6860 OITRGOP
4 ltJ Light May B FlickerinC 70 Decreasing Or Below 5 gal LOP EOQ
50 50 - 75
PUOP
NOTE
(l) H oil consumption 1a questionable 8 perform 1 S minute engine run at cruise power and calculate consumption
(2) Items Ii thru f listed under engine are symptoms ot high oil conJruDlption ollowed by the probable causes of each symptom
Most Probable Area 8 Engine
Pz-obable Causes
9 Engine (Refrlo MaIntenance Manual Section 72-0 pagbullbull 214-222)
(a) Oil in Inlet Housing and 5th and 10th Stage Bleed Ducts(front compresshyBor extension shaft housing O~ring seal malfunction or front compressor bullbullbull1)
(b) Leakage at External Engine Oil Seals (prop shaft seal or power unit Or reduction gear drive pad seal malfunction)
(coot)
56
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
(c) Oil Inside the Rear Turbine Bearing Support (rear turbine scavenge pump malfunction rear turbine bearing seal or rear turbine pump supshyport split Une se leakage l
(d) -Oil Leakage from Turbine Inlet Casing Bottom Strutbullbull(front turbine scavenge pump or diffuser scavenge pump malfunction front turbine bearing seal or inner combustion casing turbine front bearing support split line seal leakage)
(e) Power Section Breather Oil Spew - See 72-0 page 219 (high scavenge back pressure~ engine oil pump scavenge element malfuncton malshyfunction of scavenge relief valve in accessory housing - inner comshybustion casing - front turbine bearing support~-ring leakage front turbine bearing pressure oil tube leaking in ditfuser imler combustion casing piston rings at diffuser leaking front turbine or diffuser scavenge pump malfunction front turbine seal malfunction )
(f) OU Leakage from Diffuser Side Vents - Poasible Breather Spew (rear compressor bearing seal or scavenge pump malfunction)
(g) External Engine Oil Lines and Attaching Components (mechanical damage or faulty split line seals)
(h) Reduction Gear Scavenge Pumps (malfunction resulting in reduction gear filling with oil more noticeable during climb or descent)
(1) Reduction Gear Oil Pump and Filter Assembly (check valve stuck open draining tank when engine is shutdown)
(j) Power Section Oil Filter Assembly (filter check valve or bypass valve stuck Open draining tank when engine is shutdown~ probably visible at turbine inlet bottom struts)
(k) Power Section Oil Pressure Regulating Valve (stuck open draining tank when engine is shutdown probably visible at turbine inlet bottom struts)
(1) Power Section Oil Pump (scavenge element malfunction resulting in accessory case filling with oil)
Heavy maintenance or overhaul required
(cont)
57
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
10 Aircraft and ltlEC
(a) OU Cooler (leaking)
(b) Oil Tank Drain Valve (mechanical damage or shutoff leaking)
(c) Tank Swnp Drain Valve (mechanical damage or shutoff leaking)
(d) Fuel Heatemiddot (leaking)
(e) Oil Lines or Seals (mechanical damage or leakage)
([) Accessory Oil Cooler (mechanical damage)
(g) Oil Tank (mechanical damage)
(h) 011 Tank Sump (mechanical damage loose clamp or seal at tank shysump split line)
5a
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
Chart 32 Trouble Shooting
Situation
l High Stabilized T L T at 2 Ground or Air Take ~off Power 3 Power Lever--TAKE-OFF
Cockpit Indications
4 o AHigh 6 0 Normal 8 bull Temperature Trim Light OFF
TLT RPM
8 05 High 7 WHigh
HP FF
As compared to other engines
Most Probable Area 9 Engine
Probable Causes
10 Engine
a) TD Control (slope or biM lJetting incorrect or shift causing Hput condition)
(b) Temperature Adjustment Box (slope or biu etting incorrect Or IIhift causing put condition)
(c) TD Valve (stuck or binding in put condition)
(d) Fuel Control (schedule shifted rich)
NOTK Place TD control switch to NULL and advance power lever until 971degC or 90deg power lever position is attained It 971middotC is reached first select TD control switch to NORMAL If T 1 T is then below 871 ltIe the tuel control is rich and Should be replaced
(e) Trim SYJtem (it fuel control schedule is atisfactory)~Make a complete trim system check using 6799111 test kit (ret Maintenance Manual 73-4-0)
(cont)
59
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
~
u middot
NOTES
~
NOTES
u
11 Propeller
(a) Not applicable
12 Aircraft
(a) Electtical wiring (malfunction in wiring to coordinator TD valve or TD conttol)
60
w
Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
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NOTES
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NOTES
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Chart 33 Trouble Shooting
Situation Conditions
2 Ground or Air1 Low Stabilized T1 T at 3 Power Lever---TAKE-OFFTake-off Power
Cockpit Indications
(J0o4 Low 7 Low0
TIT FF
5 ~) Low 8 bull Light OFF
BP PFPF
6 bull
Normal 9 bull Light OFF8 FBPP RPM
10 bull Temperature Trim Light OFF
As compared to other engines
Most Probable Area 11 Engine
Probable Causes
12 Engme
(a) TO Control (slope or bias setting incorrect or shift causing take condition)
(b) Temperature Adjustment Box (slope or bias setting incorrect or shift causing ltak~I condition)
(c) TO Valve (stuck or binding in take condition)
(d) Fuel Control (schedule shifted lean)
NOTE Place TO control switch to NULL and advance power lever until 900 power lever is attained If T 1 T is below 9010C the fuel control is lean and should be replaced
(cont)
61
(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
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NOTES
~
NOTES
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(e) Trim System (if fuel control schedule is satisfactory) ~ Make a complete trim system check using 6199111 test kit (ref Maintenance ManuaL 73-4-0)
(f) Speed Sensitive Control (13000 rpm SWItch malfunction The tempershyture trim light must be ON for this condition to exist )
13 Propeller
(a) Not applicable
14 Aircraft
(a) Electrical Wiring (malfunction in wiring to coordinator TD valve or TD control)
62
Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
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NOTES
~
NOTES
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Chart 34~ Trouble Shooting
Situation Conditions
1 Engine Compressor Surge 2 Ground or Flight Operation
Cockpit Indications
3 () High 5 Stagnated Fluctuating or Decreasing0
T T RPM
Q Fluctuating or 6 Low (May show high If
Decreasing surge is recogni zee HP before TD Valve CJts
Gr FF
fuel )
7 Possibly above 25 mils ~ VIBR-T
As compared to other engines
Most Probable Area
B Engine
Probable Causes
9 Engine
(a) Compressor (diIty FOD faled)--Check visually at compn~s50r inlet and through the 5th and lOth stage bleed valves fot dirty Omshy
pressor or damaged rotor or stator blades Clean dirty compressor in accordance with Maintenance Manual Section 72-1-1 700 series pages
(b) Turbine (overtemperature damage) - Perform borescope inspection of turbine blades (Refer to Maintenance Manual Section 72-1-0 200 series pages)
kont)
63
() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
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NOTES
~
NOTES
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() Sensitive Valve (malfunction causing bleed valves to remain
(d) Primer Valve (malfunction stuck open)
(e) Fuel CO~ltrol schedule shIfted rich
W Inlet ObslruQtion
Propp~Jer
(a FlJght Idle Blade Angle Setting (high)
11 AirIufr
(a) Ar Ductmg (leakage)
(b) Inducer VaJve (sticking ptate valve iaulty clutch planet gears failed)
(cj Inlet Duct Anti-lcmg (soienoid valve failed)
~Engine compressor surge may be enountered dunng
a) Engine sLanmg downshifting or upshifting (with bleed air leakage from engne ctJmpressor)
(b) DeceleratlOt from Take ~off to Flight Ide
(c) Acceleration nEar Take~o(f power (riding betd follow~upL Insufficient power is avaHab~e to support the propeller blade angle
64
NOTES
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NOTES
~
NOTES
u
NOTES
~
u middot
NOTES
~
NOTES
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u middot
NOTES
~
NOTES
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NOTES
~
NOTES
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NOTES
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