SERVICE BULLETIN - 850 Caravan SB - TIME LIMITED PARTS.pdf · The tabulation of maintenance intervals as set out in this service bulletin is approved by the engine manufacturer,

SERVICE BULLETINEngines, Systems & Services – Phoenix, Arizona

Page 1 of 2TPE331-72-0476Sept 17/03

Copying, use or disclosure of information on this page is subject to proprietary restrictions.

REVISION TRANSMITTAL SHEET

This sheet transmits Revision 27 to Service Bulletin No. TPE331-72-0476 titled ENGINE – Service LifeLimits of Critical Life Limited Components, and Periodic Maintenance Schedules.

This is a COMPLETE reissue. This bulletin has been reprinted in its entirety. Please remove anddiscard all pages of prior issues and replace with pages of this revision.

Reason for Revision:

NOTE: This revision DOES NOT require further action if in compliance with a previousissue.

This service bulletin is revised to add an engine model number, update aircraft application, and updateto current format.

Section 1

Title page is revised to reflect latest revision date.

Paragraphs 1.A and 1.J are revised to add Engine Model No. TPE331-12JR-701S.

Section 2

Section 2, Table of Contents, is revised to change reference from TPE331-12JR-701C toTPE331-12JR in Table 2A title.

Updated revision number references to TPE331-72-0476.

Table 2A is revised to change reference from TPE331-12JR-701C to TPE331-12JR in title.

Table 2A is revised to add reference to Service Bulletin TPE331-A72-2093 for Gearbox in-spection and Overhaul Engine or accomplish CAM inspection.

Paragraph 2.J is revised to delete the annual per aircraft utilization requirement, clarify theapplicability of service bulletins listed in Table 5 or 6, explain why some engines are not listedin the effectivity section of some service bulletins, and to delete paragraph regarding reportingof information.

Paragraph 2.J and Step 2.J.(1) are revised to add time limit for compliance of service bulletinsin Table 5 or 6.

Table 7 is revised to add reference to Service Bulletin TPE331-A72-2093 for Reduction GearSection.

Table 7 is revised to add Fuel Control Assembly Overhaul/CAM intervals forTPE331-12JR-701S.

Paragraph 2.K is revised to delete the annual per aircraft utilization requirement.


Page 2 of 2TPE331-72-0476Sept 17/03


List of Effective Pages

Page No. Date Page No. Date 1 Sept 17/03 2 Sept 17/03 3 May 24/02 4 Sept 17/03 5 May 24/02 6 Sept 17/03 7 May 24/02 8 May 24/02 9 May 24/02 10 May 24/02 11 May 24/02 12 May 24/02 13 May 24/02 14 May 24/02 15 July 26/02 16 May 24/02 17 May 24/02 18 May 24/02 19 May 24/02 20 May 24/02 21 May 24/02 22 May 24/02 23 Sept 17/03

24 Sept 17/03 25 Sept 17/03 26 Sept 17/03 27 Sept 17/03 28 May 24/02 29 May 24/02 30 May 24/02 31 May 24/02 32 May 24/02 33 July 26/02 34 May 24/02 35 Sept 17/03 36 May 24/02 37 Sept 17/03 38 Sept 17/03 39 Sept 17/03 40 Sept 17/03 41 Sept 17/03 42 May 24/02 43 Sept 17/03 44 May 24/02 45 Sept 17/03 46 May 24/02

Previous Revisions

Revision 1 dated Jan 23/87Revision 2 dated Dec 9/87Revision 3 dated Sept 21/88Revision 4 dated Feb 17/89Revision 5 dated July 7/89Revision 6 dated Mar 2/90Revision 7 dated Sept 14/90Revision 8 dated Nov 9/90Revision 9 dated Mar 22/91Revision 10 dated Sept 20/91Revision 11 dated Dec 6/91Revision 12 dated Apr 17/92Revision 13 dated July 31/92

Revision 14 dated Feb 19/93Revision 15 dated May 10/93Revision 16 dated Sept 3/93Revision 17 dated Apr 22/94Revision 18 dated July 11/94Revision 19 dated Nov 26/97Revision 20 dated Aug 5/98Revision 21 dated Sept 7/98Revision 22 dated Oct 16/98Revision 23 dated Sept 6/99Revision 24 dated Dec 8/99Revision 25 dated May 24/02Revision 26 dated July 26/02


Page 1 of 46TPE331-72-0476Dec 15/84

Revision 27, Sept 17/03Copyright 1984, 2003 Honeywell International Inc. All rights reserved.

Category 1: Safety

ENGINE – SERVICE LIFE LIMITS OF CRITICAL LIFE LIMITED COMPONENTS,AND PERIODIC MAINTENANCE SCHEDULES

WARNING: COMPONENTS IDENTIFIED IN SECTION 2.D. OF THIS SERVICE BULLE-TIN CURRENTLY HAVE FAA CERTIFIED LIFE LIMITS, AND MUST BEREPLACED BY THE LIMITS STATED WITHIN THE SERVICE BULLETIN.HONEYWELL WILL NOT AUTHORIZE OPERATION BEYOND THE LIFELIMITS PRESENTED HEREIN, AND THESE LIFE LIMITS CANNOT BEEXTENDED BY THE INDIVIDUAL OPERATORS. IT IS THE RESPONSIBIL-ITY OF EACH OPERATOR TO ENSURE THAT LIFE LIMIT RECORDS FORCOMPONENTS IDENTIFIED IN THIS SERVICE BULLETIN ARE CORRECTAND COMPLETE. LIFE LIMITED COMPONENTS WITH NO RECORDEDHOUR OR CYCLE TRACEABILITY SHALL BE IMMEDIATELY REMOVEDFROM SERVICE.

OPERATION OF AN ENGINE WITH COMPONENTS THAT EXCEED THELIFE LIMITS IDENTIFIED IN THIS SERVICE BULLETIN CREATES SUB-STANTIAL RISK TO LIFE AND PROPERTY. SUCH AN ENGINE, FOR EX-AMPLE, MAY MALFUNCTION IN A WAY THAT LEADS TO STRUCTURALFAILURE. SUCH A FAILURE COULD INVOLVE EJECTION OF METALFRAGMENTS FROM THE ENGINE, COULD BE CATASTROPHIC ANDCOULD LEAD TO SERIOUS INJURY OR DEATH.

HONEYWELL EXPRESSLY DISCLAIMS LIABILITY FOR ANY AND ALLINJURY OR DEATH TO PERSONS OR DAMAGES TO PROPERTY, DI-RECTLY OR INDIRECTLY CAUSED BY AN ENGINE THAT IS OPERATEDWITH COMPONENTS THAT EXCEED THE CYCLE LIFE LIMITS IDENTI-FIED IN THIS SERVICE BULLETIN. HONEYWELL FURTHER DISCLAIMSLIABILITY FOR ANY AND ALL INDIRECT, CONSEQUENTIAL OR INCIDEN-TAL DAMAGES, AND WILL SEEK INDEMNITY FROM YOU FOR ANY SUCHDAMAGES.

1. Planning Information

A. Effectivity

This service bulletin is applicable to the following turboprop aircraft engines.

Part No. Model No. Serial No. Application

3103250-1 TPE331-12-701K NA No Current Application

3103400-1 TPE331-12B-701A All Shorts Basic Trainer



3108170-1/-3 TPE331-12JR-701C All CASA 212-400

3108170-2/-4 TPE331-12JR-702C All No Current Application


Page 2TPE331-72-0476Dec 15/84

Revision 27, Sept 17/03


Part No. ApplicationSerial No.Model No.

3108250-1 TPE331-12JR-701S All Aero Twin Inc Caravan

3103870-1 TPE331-12UA-701G All Metro III/23

3103870-3/-4/-8/-9 TPE331-12UAR-701G All Metro III/23

3103380-4/-12/-32/-40

TPE331-12UAR-701H All Jetstream 32

3103380-5/-13/-33/-41


3103380-6/-14/-34/-42


3103380-7/-15/-35/-43


3103380-8/-16/-36/-44


3103380-9/-17/-37/-45


3103380-10/-18/-38/-46


3103380-11/-19/-39/-47


3103520-1 TPE331-12UER-701H NA No Current Application

3103870-6/-7/-11/-12 TPE331-12UHR-701G All Metro 23

3103380-20/-24/-48/-52

TPE331-12UHR-701H All Jetstream 32

3103380-21/-25/-49/-53


3103380-22/-26/-50/-54


3103380-23/-27/-51/-55


3103380-28/-30/-56/-58

TPE331-12UHR-705H All No Current Application

3103380-29/-31/-57/-59

TPE331-12UHR-706H All No Current Application


Page 3TPE331-72-0476Dec 15/84

Revision 25, May 24/02


1. B. Reason

This service bulletin provides FAA approved life limits of certain critical components, a listingof time/cycle tracked components, periodic engine maintenance schedules, and instructionsfor providing information to Honeywell Engines, Systems & Services when life limited andtime/cycle tracked components are removed from service. Maintenance procedures arelocated in the Engine Maintenance Manual, Inspection/Repair Manual, and Engine/Component Overhaul Manuals.

The service life and reliability of any specific engine depends on many factors which vary withtype of service, operating technique, ambient conditions, and maintenance practices. Thecondition of any specific engine should be constantly evaluated by the operator based on theoperational history of the engine consistent with the above. Operators may therefore find itnecessary to accomplish major inspections and/or overhaul engines prior to the specifiedtime if such action is indicated considering mechanical condition, operational characteristicsand/or performance. Testing, operational experience, and evaluation by the manufacturerhas established that certain parts are service-limited, with such limit being determined by timeor cycles in service, or physical condition as evidenced by inspection. Such parts must bereplaced dependent on time or cycles in service and/or physical condition.

The tabulation of maintenance intervals as set out in this service bulletin is approved by theengine manufacturer, and should be considered in light of the comments above.

Continuous Airworthiness Maintenance may be implemented for engines in commercialservice. Disassembly and inspection of the engine at specified intervals (with componentparts replaced or repaired as required) will ensure engine reliability at a minimal overallmaintenance cost. Engine inspections and appropriate parts replacement form the basis ofthe program.

C. Description

This service bulletin provides:

� FAA approved life limits for certain critical components

� a listing of time/cycle tracked components

� bearing assembly, and other component replacement schedules

� a listing of periodic inspection and maintenance requirements

� requirements for Time Between Overhaul (TBO)

� requirements for Continuous Airworthiness Maintenance (CAM).

D. Compliance

Compliance addresses a safety issue.

Recommended.

TBO and CAM maintenance intervals specified in this service bulletin are the manufacturer’sapproved intervals. Individual regional airline operators may extend these intervals only withthe approval of their local FAA Flight Standards District Office (FSDO) or appropriateairworthiness regulating authority. (Refer to Section 2, Paragraph K.)


Page 4TPE331-72-0476Dec 15/84



1. E. Approval

Section 2, Accomplishment Instructions, is FAA approved.

F. Manhour Requirements

Not applicable.

G. Material - Price and Availability

Not applicable.

H. Tooling - Price and Availability

Not applicable.

I. Weight and Balance

Not applicable.

J. Publications References

The sources of information used in the preparation of this service bulletin include Honeywellengineering documentation and the following.

Part/Model No.

EngineOverhaulManual

EngineMaintenanceManual

IllustratedPartsCatalog

TPE331-12-701K NA NA NA

TPE331-12B-701A 72-00-62 72-00-61 72-00-60

TPE331-12B-702A 72-00-62 72-00-61 72-00-60

TPE331-12B-703A 72-00-62 72-00-61 72-00-60

TPE331-12JR-701C 72-01-41 72-01-40 72-01-38

TPE331-12JR-702C NA NA NA

TPE331-12JR-701S 72-01-41 72-01-40 72-01-38

TPE331-12UA-701G 72-01-37 72-01-36 72-01-34

TPE331-12UAR-701G 72-01-37 72-01-36 72-01-34

TPE331-12UAR-701H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-702H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-703H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-704H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-705H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-706H 72-00-80 72-00-79 72-00-78

TPE331-12UAR-707H 72-00-80 72-00-79 72-00-78


Page 5TPE331-72-0476Dec 15/84



Part/Model No.

IllustratedPartsCatalog

EngineMaintenanceManual

EngineOverhaulManual

TPE331-12UAR-708H 72-00-80 72-00-79 72-00-78

TPE331-12UER-701H NA NA NA

TPE331-12UHR-701G 72-01-37 72-01-36 72-01-34

TPE331-12UHR-701H 72-00-80 72-00-79 72-00-78

TPE331-12UHR-702H 72-00-80 72-00-79 72-00-78

TPE331-12UHR-703H 72-00-80 72-00-79 72-00-78

TPE331-12UHR-704H 72-00-80 72-00-79 72-00-78

TPE331-12UHR-705H 72-00-80 72-00-79 NA

TPE331-12UHR-706H 72-00-80 72-00-79 NA

1. K. Service Bulletin References

None.

L. Other Publications Affected

Inspection/Repair Manual, Report No. 72-IR-15.


Page 6TPE331-72-0476Dec 15/84



TABLE OF CONTENTS

SECTION 2 - ACCOMPLISHMENT INSTRUCTIONS PARAGRAPH PAGE

General Information 7

Update Life Limited Part Log Card A 8

Initiate New Life Limited Part Log Card B 9

Return Life Limited Part Log Card C 11

Replace Critical Components Within FAA Certified Life Limits (Cycles) D 13

Maintain Life Limited or Maint/Mod Record Card E 14

Return Life Limited or Maint/Mod Record Card (Life Tracked Parts) F 15

Bearing Assembly Replacement Schedule G 17

Periodic Inspection Requirements H 19

Time Between Overhaul (TBO) Requirements I 34

(Commercial Operation) TBO and CAM Maintenance Requirements J 38

Inspection Interval Extension K 45

SECTION 2 - TABLES TABLE NO. PAGE

Bearing Assembly Replacement Schedule 1 17

Periodic Inspection Requirements

TPE331-12B 2 19

TPE331-12JR, TPE331-12UA/-12UAR/-12UHR-701G 2A 23

TPE331-12UA, TPE331-12UAR/-12UHR-701H thru -708H 2B 28

Minimum Service Bulletin Compliance Requirements for TBO and CAM

3000 Hour TBO and 5000 Hour TBO 3 35

(Commercial Operation) 7000 Hour TBO 5 39

(Commercial Operation) 7000 Hour CAM 6 41

Maintenance Requirements for TBO or CAM

3000 Hour and 5000 Hour TBO 4 37

(Commercial Operation) 7000 Hour TBO or CAM 7 43


Page 7TPE331-72-0476Dec 15/84



2. Accomplishment Instructions

NOTE: Engine Model TPE331-12-701K has been deleted from the accomplishmentinstructions.

Engine Model TPE331-12UER-701H has no current application.

Publications listed in Section 1 provide applicable disassembly, cleaning, inspection, reassembly,and testing instructions, and must be referred to during the accomplishment of the followinginstructions.

The engine must be maintained and inspected in accordance with the applicable engine manualsand requirements of this service bulletin.

Definition of Hours (Engine Operating Hours): Any time the engine is operated in flight (liftoff totouchdown).

Definition of Cycles: Any operating sequence involving engine start, aircraft takeoff and landing,and engine shutdown.

CAUTION: (ENGINES WITH APR OR RPR) THE AUTOMATIC PERFORMANCERESERVE (APR) OR RESTRICTED POWER RESERVE (RPR) SYSTEMIS AUTHORIZED FOR USE ONLY DURING EMERGENCY CONDI-TIONS. WHENEVER APR OR RPR IS USED IN FLIGHT, THE TIMEAND CYCLES MUST BE RECORDED IN THE ENGINE LOG BOOK.

FIFTY (50) HOURS MUST BE RECORDED IN THE ENGINE LOG BOOKFOR EACH ACCUMULATED HOUR OF APR OR RPR OPERATION. INCOMPUTING ACCUMULATION OF TIME INCREMENTS OF LESSTHAN ONE (1) HOUR, THE PENALTY TIME SHALL BE CALCULATEDAS FOLLOWS: APR OR RPR TIME (IN MINUTES) DIVIDED BY 60,MULTIPLIED BY 50, EQUALS PENALTY TIME (IN HOURS). THEPENALTY HOURS MUST BE INCLUDED IN ACCUMULATION OFHOURS TOWARD TURBINE (HOT) SECTION INSPECTION.

FOUR (4) CYCLES MUST BE RECORDED ON LIFE LIMITED PARTLOG CARDS AND IN THE ENGINE LOG BOOK, AGAINST LIFELIMITED PART SERIAL NUMBERS, EACH TIME APR/RPR IS USED.

Service life limits of critical parts are based on engines being operated within approved operatinglimits, and being maintained in accordance with Honeywell published instructions. A record ofengine operating hours and cycles shall be maintained in the engine log book.

Life limited part log cards are required to provide a history of critical parts. A life limited part forwhich no history can be determined, must be removed from service.

For each cycle life limited component, the number of accumulated cycles must be recordedagainst the component part number and serial number in the engine log book and on theapplicable life limited part log card. This shall be accomplished at scheduled and unscheduledcomponent inspections, and at installation on and removal from the engine.


Page 8TPE331-72-0476Dec 15/84



In the event of an operating period during which operating cycles have not been recorded, butoperating hours can be determined, the FAA Los Angeles Aircraft Certification Office (LAACO) hasapproved debiting the life limited components with four (4) cycles per operating hour as analternate method of compliance for cycle recording. The FAA LAACO has informed Honeywellthat operators who do not comply, and who want to use a different conversion factor, shouldsubmit their request for an alternate method of compliance to the FAA LAACO along with theirsubstantiation for using a conversion factor other than four (4) cycles per operating hour.

If additional life limited part log cards are needed, contact Honeywell Engines, Systems & Ser-vices, Data Distribution, M/S 64-03/2101-201, P.O. Box 52170, Phoenix, AZ 85072-2170.

Deviation from the following procedures for updating and initiating life limited part log cardsrequires prior approval from local FAA Flight Standards District Office (FSDO), or equivalentairworthiness authority

Parts which require Hour/Cycle tracking but which are not life limited, are exempt from thisprocedure.

Previously issued life limited part log cards have a different heading for Blocks (10) and (16) thanshown in Figure 1. A signature and FAA number are now required in Blocks (10) and (16),although the column heading on older cards is “Remarks”.

NOTE: Updating the life limited part log card is required any time a life limitedpart is installed on, or removed from, an engine.

2. A. Update Life Limited Part Log Card (See Figure 1)

(1) Update the life limited part log card for a new (zero time) life limited part installed on anengine. (See Figure 1.)

(a) Verify that data in Blocks (1) thru (3) is correct.

(b) Enter date that part was installed on the engine in Block (4).

(c) Enter engine serial number in Block (5).

(d) Enter zero (0) in Blocks (6) thru (9).

(e) Sign name and enter FAA number in Block (10).

(f) No further entries are required until the part is removed from the engine.

(2) Update the life limited part log card for a used life limited part installed on an engine.(See Figure 1.)

(a) Verify that Blocks (1) thru (19) have been previously filled out, and that the datain Blocks (1) thru (3) is correct.

(b) Enter date that part was installed on the engine in Block (4).

(c) Enter engine serial number in Block (5).

(d) Enter zero (0) in Blocks (6) and (7).


Page 9TPE331-72-0476Dec 15/84



2. A. (2) (e) Enter total time (cycles and hours) on the part in Blocks (8) and (9).

(f) Sign name and enter FAA number in Block (10).

(g) No further entries are required until the part is removed from the engine.

(3) Update the life limited part log card for a life limited part removed from an engine. (SeeFigure 1.)

(a) Verify that Blocks (1) thru (9) have been previously filled out, and that the data inBlocks (1) thru (3) is correct.

(b) Verify that Block (10) has a signature and FAA number.

(c) Enter date that part was removed from the engine in Block (11).

(d) Enter time (cycles and hours) since part was installed on the engine in Blocks(12) and (13).

(e) Enter total time (cycles and hours) on part in Blocks (14) and (15).

(f) Sign name and enter FAA number in Block (16).

B. Initiate New Life Limited Part Log Card (See Figure 1)

There are certain instances when initiation of a new life limited part log card may be neces-sary:

� new engines delivered with life limited part log cards lost or unavailable

� repaired engines with life limited parts installed and no life limited part log cards pro-vided

� engines containing turbine disks or rotor assemblies whose times in service have beenconverted from hours to cycles

� spare parts for which no life limited part log cards have been provided.

(1) Initiate Life Limited Part Log Cards for Life Limited Parts Installed on a New Engine orfor a New Spare Part Without a Life Limited Part Log Card. (See Figure 1.)

(a) Fill in Blocks (1) thru (5) from information provided on critical parts list, includedin the engine log book, and D.S.C. (Data Sheet, Customer), for each life limitedpart.

(b) Enter zero (0) in Blocks (6) and (7).

(c) Sign name and enter FAA number in Block (10).

(d) No further entries are required until the part is removed from the engine.


Page 10TPE331-72-0476Dec 15/84



NOTE: Life Limited Components with no recorded time or cycle trace-ability shall be removed from service. Refer to Paragraph 2.D.

2. B. (2) Initiate Life Limited Part Log Cards for Life Limited Parts Installed on a RepairedEngine and no Life Limited Part Log Cards Provided. (See Figure 1.)

(a) Fill in Blocks (1) thru (5) from information provided on critical parts list, includedin the engine log book and build documents, for each life limited part.


(c) Enter total time (cycles and hours) on part, when part was installed on theengine, in Blocks (8) and (9).

(d) Enter date engine was repaired in Blocks (4) and (17).

(e) Enter method used to determine total time (hours and cycles) in Block (18).

(f) Sign name and enter FAA number in Blocks (10) and (19).

NOTE: Life Limited Components with no recorded time or cycletraceability must be removed from service. Refer to Paragraph2.D.

(3) Initiate Life Limited Part Log Cards for Life Limited Parts, Time in Service ConvertedFrom Hours to Cycles, Installed on a Repaired Engine and no Life Limited Part LogCards Provided. (See Figure 1.)

(a) Fill in Blocks (1) thru (5) from information provided on critical parts list, includedin the engine log book, or build documents if the parts were installed at repair orat scheduled maintenance, for each life limited part.


(c) Enter total time (cycles and hours) on the part in Blocks (8) and (9).

(d) Enter date part was installed on the engine in Blocks (4) and (17).

(e) Enter method used to determine time (hours and cycles) in Block (18).

(f) Sign name and enter FAA number in Blocks (10) and (19).


Page 11TPE331-72-0476Dec 15/84



2. C. Return Life Limited Part Log Card to Honeywell

NOTE: When life limited parts are removed from service, please provide thefollowing to Honeywell Engines, Systems & Services, Reliability, Safety,and Maintainability, Dept 93-42/551-18, P.O. Box 52181, Phoenix, AZ85072-2181.

(1) Life limited part log card. If a card is not available, initiate card as shown in Figure 1and enter all available data on the card.

(a) Part number of part.

(b) Serial number of part.

(c) Hours or cycles on part.

(d) Reason for removing part.


Page 12TPE331-72-0476Dec 15/84



Life Limited Part Log Card and Maintenance RecordFigure 1


Page 13TPE331-72-0476Dec 15/84



2. D. Replace Critical Components Within FAA Certified Life Limits (Cycles)

WARNING: THE FOLLOWING COMPONENTS HAVE FAA CERTIFIED LIFELIMITS AND MUST BE REPLACED WITHIN THE SPECIFIED LIFELIMITS. THESE LIFE LIMITS CAN NOT BE EXTENDED BY INDI-VIDUAL OPERATORS.

LIFE LIMITED COMPONENTS WITH NO RECORDED HOUR ORCYCLE TRACEABILITY MUST BE IMMEDIATELY REMOVEDFROM SERVICE.

REFER TO THE WARNING INFORMATION ON PAGE 1 OF THISSERVICE BULLETIN.

Component Part No. Operating Cycles

First Stage Compressor Impeller 3103252-2/-3 30,000

First Stage Compressor Impeller 3107097-1/-2 30,000

*First Stage Compressor Impeller 3107149-1 30,000



Second Stage Compressor Impeller 3103254-2/-3/-4 30,000

*First Stage Turbine Rotor Disk 3103272-1/-2/-3 10,000

*First Stage Turbine Rotor Disk 3103836-1/-2 10,000

*First Stage Turbine Rotor Disk 3103836-3 20,000

*First Stage Turbine Rotor Disk 3107101-1 20,000

*Second Stage Turbine Rotor Disk 3103274-3 10,000

*Second Stage Turbine Rotor Disk 3103752-3/-4 10,000







Third Stage Turbine Rotor Assy 3103303-1/-3/-4 6,000

Third Stage Turbine Rotor Assy 3103838-1/-2 12,000

*Rotating Air Seal 3103313-1/-2 10,000

*Rotating Air Seal 3103755-1/-2/-5 20,000

*Rotating Air Seal 3103839-1/-3 20,000

*Rotating Air Seal 3103921-1 30,000


Page 14TPE331-72-0476Dec 15/84



Component Operating CyclesPart No.




*This part is a component of an assembly. Some Life Limited Part Log Cards have beeninitiated with only the assembly part number listed. In these cases the correct partnumber of the life limited component should be added to the Life Limited Part Log Card.The correct component part number can be determined by consulting the applicableIllustrated Parts Catalog or from the actual part itself. Only the component part, aslisted in this service bulletin, is life limited. The assembly part number is included onlyto aid in traceability.

2. E. Maintain Life Limited Part Log Card or Component Maintenance/Modification RecordCard for Identified Engine Component Parts Which Do Not Have FAA Certified LifeLimits (See Figure 1 or 2)

NOTE : Certain engine component parts do not have a finite cycle life limitassigned. Therefore, to provide a historical record of hours, cycles,service history and maintenance performed for the specified parts, aLife Limited Part Log Card or Component Maintenance/ModificationRecord Card must be maintained. If a part is removed, the Life LimitedPart Log Card or Component Maintenance/Modification Record Cardmust be updated and stay with that part.

Components already in service for which no Life Limited Part Log Cardor Component Maintenance/Modification Record Card has beenestablished, but for which history can be determined, must have lifetracking established at next access to the affected part in conjunctionwith a maintenance action (scheduled or unscheduled).

Component Part No. Note

Bearings Refer to Table 1.

Fuel Control All

Fuel Pump All

Fuel Shutoff Valve All

Propeller Governor All

Propeller Pitch Control All

Torque/Temperature Limiter Bypass Valve All (If Installed)

First Stage Turbine Rotor Blade 3108126-1 1

Splined Spur Gearshaft (Bull) 3107118-1 2






Page 15TPE331-72-0476Dec 15/84

Revision 26, July 26/02


Component NotePart No.

Splined Spur Gearshaft (Bull) 3108295-1 2, 4


Spur-Drive Gearshaft (Sun) 3108202-1/-2 2, 4, 5

Spur-Drive Gearshaft (Sun) 3108203-2 3, 5

High Speed Pinion 3101741-2 2, 4

High Speed Pinion 3101741-4 3

High Speed Pinion Assembly 3107036-2 2, 4

High Speed Pinion Assembly 3107036-10/-11 3

Diaphragm Matched Housing Sets 3101540-8/-9 2, 3, 4

Diaphragm Matched Housing Sets 3106330-1 3

Diaphragm Module Assembly 3102593-7/-10 2, 4

Diaphragm Module Assembly 3103621-1/-2 3

NOTE 1. A separate card must be maintained for each blade.

NOTE 2. Refer to Service Bulletin TPE331-A72-2087 for detailed instructions.



NOTE 5. Accomplish a complete inspection (including gear tooth involuteinspection, which must be done at a Honeywell authorized facility, inaccordance with Inspection/Repair Manual, Report No. 72-IR-15) atengine overhaul or CAM inspection, not to exceed 7100 operatinghours.

2. F. Return Life Limited Part Log Card or Component Maintenance/Modification RecordCard to Honeywell

NOTE: When time/cycle tracked parts are removed from service, pleaseprovide the following to Honeywell Engines, Systems & Services,Reliability, Safety, and Maintainability, Dept 93-42/551-18, P.O. Box52181, Phoenix, AZ 85072-2181.

(1) Life limited part log card or component maintenance/modification record card. If card isnot available, initiate card as shown in Figure 1 or 2 and enter all available data oncard.

(a) Part number of part.

(b) Serial number of part.

(c) Hours or cycles on part.

(d) Reason for removing part.


Page 16TPE331-72-0476Dec 15/84



COMPONENT MAINTENANCE / MODIFICATION RECORD CARD(RECORD CARD MUST TRAVEL WITH COMPONENT, REPAIR STATION OR ENGINE LOG BOOK)

PART NOMENCLATURE PART NUMBER

SERIAL NUMBER SERIES NUMBER CHANGE/MOD RECORD

ENGINESERIAL NO.

AIRCRAFTSERIAL NO.

ENGINE HOURSAT INSTALLATION

ENGINE HOURSAT REMOVAL

TOTAL HOURSON PART

DATE – STATIONREASON FOR REMOVAL

COMPONENT MAINTENANCE / MODIFICATION RECORD CARD(SERVICE BULLETIN COMPLIANCE, REPAIRS, INSPECTIONS, ETC)

DATE MAINTENANCE PERFORMED CHANGE/MOD RECORD AUTHORIZED SIGNATURE

SB1433

Component Maintenance/Modification Record CardFigure 2


Page 17TPE331-72-0476Dec 15/84



2. G. Bearing Assembly Replacement Schedule

CAUTION: INSTALL A NEW BEARING WHERE INDICATED BY + IN TABLE 1.THE ENGINE MANUFACTURER DOES NOT AUTHORIZEINSTALLATION OF ANY CONTINUED TIME, REMANUFACTURED,REPAIRED, OR RESTORED BEARING AT THOSE LOCATIONS

NOTE: Bearing replacement intervals listed below are approved by the enginemanufacturer. To provide a historical record of hours, cycles, servicehistory and maintenance performed for the specified bearings, a LifeLimited Part Log Card or Component Maintenance/Modification RecordCard must be maintained. If bearing is removed, the Life Limited PartLog Card or Component Maintenance/Modification Record Card mustbe updated and stay with that bearing.

Bearings already in service for which no Life Limited Part Log Card orComponent Maintenance/Modification Record Card has beenestablished, but for which history can be determined, need to have lifetracking established at next removal of, or access to, the affectedbearing in conjunction with a maintenance action (scheduled orunscheduled). Bearings already in service for which history is uncertainmust be replaced at next major CAM inspection or overhaul, and lifetracking must be established at that time.

Bearings with a replacement interval of “on condition”, or with nomaximum service life, may be reused indefinitely provided they meetinspection requirements detailed in Engine Maintenance Manual orInspection/Repair Manual. They do not require Life Limited Part LogCards or Component Maintenance/Modification Record Cards.

Some bearings may have one or more asterisks (*) etched adjacent tothe part number. Each asterisk indicates one engine overhaul or CAMinspection interval beyond the first OH/CAM.

Table 1. Bearing Assembly Replacement Schedule

Part No. Part NameBearing ReplacementInterval (TSN) Hours

+3101092-1/-2 Turbine Roller Bearing (Rear Main Shaft) Each TurbineSection Inspection

3101500-1 Matched Roller Bearing and Shaft Set(High Speed Pinion)

On Condition

#3101509-2 Matched Planet Gear and Bearing On Condition

3101689-1 Helical Gearshaft Roller Bearing (Sun and Bull Gear) On Condition

#3102561-1/-3 Matched Planet Gear and Bearing On Condition

3102885-1 Propeller Shaft Flanged Annular Ball Bearing On Condition


Page 18TPE331-72-0476Dec 15/84



Table 1. Bearing Assembly Replacement Schedule (Cont)

Part No.Bearing ReplacementInterval (TSN) HoursPart Name

+3103035-1 Annular Ball Bearing (Matched Set) Each EngineOverhaul or majorCAM inspection

+3103333-3/-6 Compressor Bearing 9000

+3103585-1 Bearing, Ball, Duplex 9000

+3108042-2 Double Row Roller Bearing 14200

+3108098-1 Turbine Roller Bearing (Rear Main Shaft) Each EngineOverhaul or majorCAM inspection

+358206 Starter Generator Gearshaft Ball Bearing 9000

358267 Propeller Shaft Flanged Annular Ball Bearing On Condition

358271 Idler Gearshaft Roller Bearing On Condition

+358272 Hydraulic Pump, Idler and Fuel Control DriveGearshaft Ball Bearing

9000

358348 Tachometer Generator and Propeller GovernorBall Bearing

On Condition

358360-1/-5 Rear Propshaft Roller Bearing On Condition

358361-1 Propeller Shaft Annular Ball Bearing On Condition

+358894-1 Fuel Control Drive Gear Bearing Set 9000

#Bearing must pass “On-Condition” inspection. If bearing passes inspection, it is reusableonly if the gear involute and M.O.W. inspections are within limits.

+Replace only with a new (0 TSN) bearing.


Page 19TPE331-72-0476Dec 15/84



2. H. Periodic Inspection Requirements

NOTE: If in conflict with the Engine Maintenance Manual, these inspectioninterval requirements supersede requirements listed in Table 601 of theEngine Maintenance Manual. The accomplishment of the inspections isdescribed in the Engine Maintenance Manual.

Maintain and inspect all accessories and/or electronic components notlisted in Tables 2, 2A, 2B, 4, and 7 in accordance with the applicableEngine Maintenance Manual, Chapter 72-00-00, Adjustment/Test, andapplicable Inspection/Check and Adjustment/Test section for eachaccessory/component.

Table 2. (TPE331-12B) Periodic Inspection RequirementsInspection Interval Inspection Chapt/Sect/Subj

Pre-Flight Air Inlet 72-00-00 (Refer to Trouble Shooting, Table 101.)

Check for obstructions, evidence of FOD, and for oil leakage from thecompressor air/oil seal.

Exhaust Pipe 72-00-00 (Refer to Trouble Shooting, Table 101.)

Check for oil leakage from turbine air-oil seal.

First Stage CompressorImpeller

72-30-01

Check for evidence of FOD.

Daily (Pre-Flight) Oil Level 72-00-00 (Refer to Servicing, Table of Contents,for paragraph reference and page number of pro-cedure to follow.)

Must be above ADD mark.

Fuel Control ManualShutoff Lever

73-21-05

Cycle shutoff lever and associated linkage to ensure sufficient freedom ofoperation.

Oil Filter Bypass Valve 79-20-04

Check for extended indicator pin.

Magnetic Chip Detector(Installed)

79-30-01

Check for continuity between pin of electrical connector and ground.

Every 50 Hours Overspeed Governor(Manual Mode)

72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page numberof procedure to follow.)

Every 100 Hours Spectrometric Oil AnalysisProgram (SOAP) and OilFilter

72-00-00 (Refer to Inspection/Check, Table ofContents, for paragraph reference and page num-ber of procedure to follow.) (Refer to SBTPE331-A79-0034.)


Page 20TPE331-72-0476Dec 15/84



Table 2. (TPE331-12B) Periodic Inspection Requirements (Cont)Inspection Interval Chapt/Sect/SubjInspection

Every 125 Hours (Pre SB TPE331-A72-2078,-12B-701A/-702A only) Fuel Control P3 Air Filter

73-21-05, 79-20-03, 79-20-10

Remove and clean the filter element. If the filter element is contaminatedwith oil, clean and inspect the air/oil accumulator system check valves andremove the Fuel Control Unit for internal cleaning.

(Post SB TPE331-A72-2078,-12B-703A only) Fuel Control P3 Air Filter

73-21-05, 79-20-03, 79-20-10

Remove and clean the filter element.(Post SB TPE331-A72-2078,-12B-703A only) InvertedOil System P3 Air Filter

73-21-05, 79-20-03, 79-20-10

Remove and clean the filter element.(Post SB TPE331-A72-2078,-12B-703A only orPost SB TPE331-79-0020,-12B-701A/-702A only)Filter Screen

79-20-10

Remove and clean the filter.(Pre SB TPE331-A72-2078,-12B-701A/-702A only)Fuel Control Filtered OrificeAssembly

73-21-05, 79-20-03, 79-20-10

Remove and inspect the orifice assembly. If the orifice assembly iscontaminated with oil, clean and inspect the air/oil accumulator systemcheck valves, and remove the Fuel Control Unit for internal cleaning.

Magnetic Chip Detector 79-30-01Remove and inspect for chips. Clean or replace with a serviceable unit.

Fuel Filter 73-21-03Remove and replace filter element.

Fuel Flow Divider and DrainValve Filter

73-10-07

Remove, clean, and inspect, filter element.Fuel Manifold PurgeSystem Filter

73-10-13

Remove, clean, and inspect, filter element.Compensating Resistor 72-00-00 (Refer to Inspection/Check, Table of

Contents, for paragraph reference and page num-ber of procedure to follow.)

Test temperature compensation value.Input Gearbox Drain 72-00-05

Check to make sure that drain is open. Use air to check drain port passage,as damage to crossover duct could result from the use of hard objects tocheck passages.


Page 21TPE331-72-0476Dec 15/84




Every 250 Hours Emergency ShutdownSystems

72-00-00 (Refer to Inspection/Check, Table ofContents, for paragraph reference and page num-ber of procedure to follow.)

Operate airframe emergency feather/fuel shutoff systems to determine ifengine feathering valve and fuel shutoff valve have actuated.

Plumbing Lines andConnections

Check for security, leaks, cracks, cuts, and rubbing.

Electrical Wiring andConnections

Check for security and damage.

Auto Ignition Switch 74-30-01

Functional test switch.

Controls Linkage Assembly 76-10-01

Check for security of locking features. Check for proper alignment of controlrod, arms and levers, and for damage. Check bolts and screws securingarms and levers to serrated shaft. Lubricate rod end bearings if binding isnoted.

Igniter Plugs 74-20-01

Remove, clean and inspect.

Fuel Manifold and NozzleAssembly

73-10-09 (Refer to NOTE 1.)

Fuel Control/Fuel PumpIntegrity


NTS Ground Check 72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page numberof inspection procedure to follow.)

Check operation of NTS system. This check shall be performed every 250hours operating time, and any time maintenance is performed on torquesensing or NTS system components.

Plenum Drain Valves 72-00-05

Check operation of plenum drain valves without removing from engine asfollows: With engine not operating, plenum drain valves should be open.Open position may be assured if air passes freely through valve when slightair pressure is applied at the attached drain tubes.

Engine Oil (Type I) 72-00-00 (Refer to Servicing, Table of Contents,for paragraph reference and page number of pro-cedure to follow.)

Drain and refill with new oil.


Page 22TPE331-72-0476Dec 15/84




Every 500 Hours Plenum Drain Valves 72-00-05

Remove and test for opening and closing.

Engine Oil (Type II) 72-00-00 (Refer to Servicing, Table of Contents,for paragraph reference and page number of pro-cedure to follow.)


Every 1000 Hours (Pre SB TPE331-72-0983)Torque Load Arm


Applied torque inspection.

Starter-Generator DriveGearshaft Insert (SplinedAdapter)

72-10-13

Inspect for wear at EVERY access.

Every 1400 to1600 Hours

Compressor Air/Oil Sealand Rotor

72-10-19

Gearbox 72-00-00 (Refer to Inspection/Check, Table ofContents, for paragraph reference and page num-ber of procedure to follow.) (Refer to SBTPE331-A72-2092.)

Turbine (Hot) Section 72-00-00 (Refer to Inspection/Check, Table ofContents, for paragraph reference and page num-ber of procedure to follow.)


Overhaul Engine Refer to Paragraph 2.I. of this service bulletin.Refer to SB TPE331-A72-2092.

NOTE 1. Fuel nozzle assembly inspections may be accomplished in conjunction with anairframe inspection, but do not exceed inspection interval listed. Fuel nozzleassemblies must be replaced with new or cleaned fuel nozzle assembliesevery 250 operating hours. Perform hot gas path inspection (borescope in-spection) following detection of secondary nozzle plugging, which exceeds20% of total secondary flow, or two plugged nozzles.


Page 23TPE331-72-0476Dec 15/84



Table 2A. (TPE331-12JR, TPE331-12UA/-12UAR/-12UHR-701G)Periodic Inspection Requirements

Inspection Interval Inspection Chapt/Sect/Subj


Check for obstructions, evidence of FOD, and for oil leakage from compressorair-oil seal.




72-30-01


Daily (Pre-Flight) Oil Level 72-00-00 (Refer to Servicing, Table of Contents, forparagraph reference and page number of procedureto follow.)


(TPE331-12UA/-12UAR/-12UHR-701G) Every 100Hours

Spectrometric OilAnalysis Program(SOAP) and Oil Filter

72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SBTPE331-A79-0034.)

(TPE331-12JR)Every 150 Hours

Oil Filter 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) Inspection should be accom-plished in conjunction with an airframe inspection, butdo not exceed 155 hours.

Every 150 Hours Fuel Filter 73-21-03

Remove and replace filter element.

Compensating Resistor 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Test temperature compensation value.

Input Gearbox Drain



72-00-00 (Refer to Inspection/Check,Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)



72-30-01



Page 24TPE331-72-0476Dec 15/84



Table 2A. (TPE331-12JR, TPE331-12UA/-12UAR/-12UHR-701G)Periodic Inspection Requirements (Cont)

Inspection Interval Chapt/Sect/SubjInspection

Every 300 Hours Overspeed Governor 72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Operational check.

NTS System GroundCheck

72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Check operation of NTS system. This check shall be performed every 300hours operating time, and any time maintenance is performed on torque sens-ing or NTS system components.

Fuel Manifold PurgeSystem Filter

73-10-13

Remove and clean filter element.





Magnetic Drain Plug(Chip Detector)

79-30-01

Remove and inspect. For two piece unit, remove knurled plug and accomplishvisual inspection.

Controls LinkageAssembly

76-10-01

Check for security of locking features. Check for proper alignment of controlrod, arms and levers, and for damage. Check bolts and screws securing armsand levers to serrated shaft. Lubricate rod end bearings if binding is noted.



Igniter Plugs 74-20-01


Plenum Drain Valves

Check operation of plenum drain valves without removing from engine as fol-lows: With engine not operating, plenum drain valves should be open. Openposition may be assured if air passes freely through valve when slight air pres-sure is applied at the attached drain tubes.

Fuel Flow Divider ValveFilter

73-10-07

Remove, clean and inspect filter element.


Page 25TPE331-72-0476Dec 15/84





Every 300 Hours Torque Limiter BypassValve Filter

73-22-01

Remove and clean.

Every 400 Hours Engine Oil Change(Type I)

72-00-00 (Refer to Servicing, Table of Contents, forparagraph reference and page number of procedureto follow.)


Every 450 Hours Fuel Manifold andNozzle Assemblies




Every 900 Hours Engine Oil Change(Type II)



Every 1000 Hours (Pre SBTPE331-72-0818)Torque Load Arm

72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)


Every 1400 to1600 Hours for

Compressor Air/OilSeal and Rotor

72-10-19

3000 Hour TBO Turbine (Hot) Section 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Gearbox 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SB TPE331-A72-2087and TPE331-A72-2093.)



72-10-19


Gearbox 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SB TPE331-A72-2087and TPE331-A72-2093.)

Propeller Pitch ControlCam Assembly

72-10-02

Inspect after disassembly in accordance with the Engine Maintenance Manual.


Page 26TPE331-72-0476Dec 15/84






Overhaul Engine Refer to Paragraph 2.I. of this service bulletin. Referto SB TPE331-A72-2087 and TPE331-A72-2093.


Compressor Air/OilSeal and Rotor

72-10-19

7000 Hour TBO orCAM Inspectionwith Gearbox

Turbine (Hot) Section 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

InspectionGearbox 72-00-00 (Refer to Inspection/Check, Table of Con-

tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SB TPE331-A72-2087and TPE331-A72-2093.)


72-10-02


Every 3400 to3600 Hours for7000 Hour TBO or


CAM Inspectionwithout Gearbox

Gearbox Refer to SB TPE331-A72-2087 andTPE331-A72-2093.

InspectionPropeller Pitch ControlCam Assembly

72-10-02


No later than 3700Hours



Every 3700(Spline) HoursMaximum

Fuel Control/Fuel PumpMating Spline

72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to NOTE 2.)


Overhaul Engine Refer to Paragraph 2.I. of this service bulletin. Referto SB TPE331-A72-2087 and TPE331-A72-2093.


Overhaul Engine oraccomplish CAMinspection

Refer to Paragraph 2.J. of this service bulletin. Referto SB TPE331-A72-2087 and TPE331-A72-2093.


Page 27TPE331-72-0476Dec 15/84





Annually Magnesium Housing 72-10-09 (Nose Cone Assembly)(In conjunction Corrosion 72-10-20 (Accessory Drive Housing)with an airframeannual inspectionor an equivalentaircraft inspection.)

Inspect exposed painted surfaces for missing, peeling, cracked, blistered,crinkled or scratched paint. Repair areas that have missing, peeling, cracked,blistered, crinkled or scratched paint. There is no limit to the size or number ofdefective or damaged paint areas which may be repaired provided that anycorrosion present has penetrated less than 0.010 inch. If corrosion has pene-trated 0.010 inch or more, refer to appropriate section for inspection limits.Repair in accordance with 72-00-00, Cleaning/Painting, Repair of Defective orDamaged Paint and Minor Corrosion on Magnesium Components.


NOTE 2. All Fuel Pumps installed with Fuel Control Units EXCEPT Fuel Control Units,Part No. 897801-1/-2/-3.

· Inspect Fuel Pump and Fuel Control Unit splines at the periodic 3700 hour interval.

· Inspect replacement Fuel Pump and Fuel Control Unit splines at time of replacementof either Fuel Pump or Fuel Control Unit. (Spline inspection of new or newly over-hauled component not required.)

· Inspect Fuel Pump splines when replacement Fuel Control Unit is installed. (Splineinspection of new or newly overhauled Fuel Pump not required.)

· Inspect Fuel Control splines when replacement Fuel Pump is installed. (Spline in-spection of new or newly overhauled Fuel Control not required.)

All Fuel Pumps installed with Fuel Control Units, Part No. 897801-1/-2/-3.

· Inspect Fuel Pump splines at time of installation of Fuel Control Unit.

· Inspect Fuel Pump splines when replacement Fuel Pump is installed. (Splineinspection of new or newly overhauled Fuel Pump not required.)


Page 28TPE331-72-0476Dec 15/84



Table 2B. (TPE331-12UA/-12UAR/-12UHR-701H through -708H)Periodic Inspection Requirements

Inspection Interval Inspection Chapt/Sect/Subj


Check for obstructions, evidence of FOD, and for oil leakage from compressorair-oil seal.



Daily (Pre-Flight) Oil Level 72-00-00 (Refer to Servicing, Table of Contents, forparagraph reference and page number of procedureto follow.)


Every 100 Hours Spectrometric OilAnalysis Program(SOAP) and Oil Filter

72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SBTPE331-A79-0034.)




Fuel Filter 73-21-03

(Aircraft without a Fuel Filter By-pass Light)

Remove and replace with a new filter element.

Input Gearbox Drain


Compensating Resistor 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Test temperature compensation value.


Page 29TPE331-72-0476Dec 15/84



Table 2B. (TPE331-12UA/-12UAR/-12UHR-701H through -708H)Periodic Inspection Requirements (Cont)


Every 200 Hours First Stage CompressorImpeller

72-30-01


Every 300 Hours Overspeed Governor 72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Operational check.

NTS System GroundCheck

72-00-00 (Refer to Adjustment/Test, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.)

Check operation of NTS system. This check must be performed every 300hours operating time, and any time maintenance is performed on torque sens-ing or NTS system components.

Fuel Filter 73-21-03

(Aircraft with a Fuel Filter By-pass Light)

Remove and replace with a new filter element.

Every 400 Hours Controls LinkageAssembly

76-10-01

Check for security of locking features. Check for proper alignment of controlrod, arms and levers, and for damage. Check bolts and screws securing armsand levers to serrated shaft. Lubricate rod end bearings if binding is noted.



Fuel Manifold PurgeSystem Filter

73-10-13

Remove, clean, and inspect, filter element.



Magnetic Drain Plug(Chip Detector)

79-30-01

Remove and inspect. For two piece unit, remove knurled plug and accomplishvisual inspection.


Page 30TPE331-72-0476Dec 15/84





Every 400 Hours Igniter Plugs 74-20-01


Plenum Drain Valves

Check operation of plenum drain valves without removing from engine as fol-lows: With engine not operating, plenum drain valves should be open. Openposition may be assured if air passes freely through valve when slight air pres-sure is applied at the attached drain tubes.

Torque Limiter BypassValve Filter

73-22-01


Fuel Flow Divider andDrain Valve Filter

73-10-07


Engine Oil Change(Type I)


Operators have an alternative for engine oil change. They can change theengine oil at regularly scheduled hours or they can send oil samples foranalysis at regularly scheduled hours and change the engine oil (at the nextscheduled 205 hour check) after an unsatisfactory oil sample analysis. Oilsamples are analyzed for Total Acid Number (TAN) and viscosity.

Send the initial sample for analysis at 400 hours (since new or last change)and send a new sample at each subsequent 205 hours of engine operation.Change the engine oil at the next 205 hour check after an unsatisfactory oilsample.



Every 450 Hours Fuel Manifold andNozzle Assemblies





Page 31TPE331-72-0476Dec 15/84





Every 900 Hours Engine Oil Change(Type II)


Operators have an alternative for engine oil change. They can change theengine oil at regularly scheduled hours or they can send oil samples foranalysis at regularly scheduled hours and change the engine oil (at the nextscheduled 205 hour check) after an unsatisfactory oil sample analysis. Oilsamples are analyzed for Total Acid Number (TAN) and viscosity.Send the initial sample for analysis at 900 hours (since new or last change)and send a new sample at each subsequent 205 hours of engine operation.Change the engine oil at the next 205 hour check after an unsatisfactory oilsample.

Every 1000 Hours (Pre SBTPE331-72-0818)Torque Load Arm





72-10-19


Gearbox 72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SBTPE331-A72-2087.)



72-10-19


Gearbox 72-00-00 (Refer to Inspection/Check,Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SBTPE331-A72-2087.)


Overhaul Engine Refer to Paragraph 2.I. of this service bulletin. Referto SB TPE331-A72-2087.


Page 32TPE331-72-0476Dec 15/84







72-10-19

7000 Hour TBO orCAM Inspectionwith Gearbox


InspectionGearbox 72-00-00 (Refer to Inspection/Check, Table of Con-

tents, for paragraph reference and page number ofprocedure to follow.) (Refer to SBTPE331-A72-2087.)


72-10-02


Every 3400 to3600 Hours for7000 Hour TBO or


CAM Inspection Gearbox Refer to SB TPE331-A72-2087.without GearboxInspection Propeller Pitch Control

Cam Assembly72-10-02


No later than 3700Hours



Every 3700(Spline) HoursMaximum

Fuel Control/Fuel PumpMating Spline

72-00-00 (Refer to Inspection/Check, Table of Con-tents, for paragraph reference and page number ofprocedure to follow.) (Refer to NOTE 2.)


Overhaul Engine Refer to Paragraph 2.I. of this service bulletin. Referto SB TPE331-A72-2087.


Overhaul Engine oraccomplish CAM inspec-tion

Refer to Paragraph 2.J. of this service bulletin. Referto SB TPE331-A72-2087.

Annually Magnesium Housing 72-10-09 (Nose Cone Assembly)(In conjunction Corrosion 72-10-20 (Accessory Drive Housing)with an airframeannual inspectionor an equivalentaircraft inspection.)

Inspect exposed painted surfaces for missing, peeling, cracked, blistered,crinkled or scratched paint. Repair areas that have missing, peeling, cracked,blistered, crinkled or scratched paint. There is no limit to the size or number ofdefective or damaged paint areas which may be repaired provided that anycorrosion present has penetrated less than 0.010 inch. If corrosion has pene-trated 0.010 inch or more, refer to appropriate section for inspection limits.Repair in accordance with 72-00-00, Cleaning/Painting, Repair of Defective orDamaged Paint and Minor Corrosion on Magnesium Components.


Page 33TPE331-72-0476Dec 15/84

Revision 26, July 26/02





NOTE 2. All Fuel Pumps installed with Fuel Control Units EXCEPT Fuel Control Units,Part No. 897801-1/-2/-3.

· Inspect Fuel Pump and Fuel Control Unit splines at the periodic 3700 hour interval.

· Inspect replacement Fuel Pump and Fuel Control Unit splines at time of replacementof either Fuel Pump or Fuel Control Unit. (Spline inspection of new or newly over-hauled component not required.)

· Inspect Fuel Pump splines when replacement Fuel Control Unit is installed. (Splineinspection of new or newly overhauled Fuel Pump not required.)

· Inspect Fuel Control splines when replacement Fuel Pump is installed. (Spline in-spection of new or newly overhauled Fuel Control not required.)

All Fuel Pumps installed with Fuel Control Units, Part No. 897801-1/-2/-3.

· Inspect Fuel Pump splines at time of installation of Fuel Control Unit.

· Inspect Fuel Pump splines when replacement Fuel Pump is installed. (Splineinspection of new or newly overhauled Fuel Pump not required.)


Page 34TPE331-72-0476Dec 15/84



2. I. Time Between Overhaul (TBO) Requirements

NOTE: Engine Models TPE331-12B-701A/-702A/-703A, are only approved for3000 hour TBO.

Engine Model TPE331-12JR-701C is only approved for 3000 and 5000hour TBO.

Operating to a specific TBO interval requires compliance with service bulletins listed in Table3, and maintenance actions listed in Table 4. Operation in excess of the maintenance actionhourly limits listed in Table 4, applicable to the specific TBO interval elected by the operator isnot approved by the engine manufacturer. Engine performance should be consistent withapproved aircraft operational requirements.

Service bulletins listed in Table 3 may not be applicable to all engine models listed in Section1.A of this service bulletin. Refer to Section 1.A of each individual service bulletin todetermine engine applicability.

Honeywell furnished accessories which require overhaul are listed in Table 4.

(1) Engine Configuration Requirements (Service Bulletin Compliance) for TBO Operation.

CAUTION: ALL APPLICABLE ALERT SERVICE BULLETINS MUST BECOMPLIED WITH. REFER TO EACH INDIVIDUAL ALERTSERVICE BULLETIN FOR COMPLIANCE REQUIREMENTS.

SERVICE BULLETINS LISTED IN TABLE 3 ARE THEMINIMUM REQUIREMENTS.

Revision of this service bulletin may have introduced new service bulletins, in Table 3,not previously required for a particular engine model and TBO interval. Except for alertservice bulletins, any new service bulletin added to Table 3 must be complied with notlater than the next engine overhaul based on the currently elected TBO interval.

All applicable alert service bulletins, including those not specified in Table 3, must becomplied with according to their respective compliance schedules.

Operators electing a different (extended) TBO interval must be in compliance with theTable 3 service bulletin requirements of the newly elected TBO interval not later thanthe specified overhaul hourly limit of the superseded TBO interval.

Compliance with a service bulletin which supersedes one listed in Table 3 will satisfyrequirements for the specific TBO interval, even though the service bulletin is not listedin Table 3.


Page 35TPE331-72-0476Dec 15/84



Table 3. Minimum Service Bulletin Requirement for TBO TBO Intervals –––––––––––––––––––––––––––––––––––––––––––––––––––> 3000 5000

Service Bulletin Subject Service Bulletin Number

Replace Aft Curvic Coupling 72-0688 or72-0774

72-0774

Oil Transfer Tube 72-0736 or72-0750

72-0736

Spring Washer/Notched Spacer 72-0751 or72-0755

72-0751

Accessory Drive Housing (Insert and Packing) 72-0763 72-0763Increased Impeller Clearances 72-0781 72-0781Second Stage Turbine Components 72-0788 or

72-092772-0788

Propeller Governor Assembly (Speeder Spring and Reset Piston) 72-0789 72-0789Turbine Bearing Retainer 72-0802 72-0802Torque Load Assembly 72-0818 or

72-098372-0818

First Stage Turbine Components 72-0851Propeller Shaft Coupling 72-0871 72-0871Turbine Main Shaft Nut 72-0935 72-0935Oil Pressure Pump 72-0952 72-0952Propeller Pitch Control Assembly 72-0958 and

72-096872-0958 and72-0968

Turbine Scavenge Oil Pump Gasket 72-0962 72-0962Diaphragm Gasket 72-2084 72-2084Nose Cone Gasket 72-0966 72-0966Oil Scavenge Pump (Turbine) 72-2074 72-2074P3 Gasket 72-2000 72-2000First Stage Turbine Nozzle Components 72-2002 72-2002Compressor Seals 72-2003 72-2003Non-Metallic Washer (Starter/Generator Pad) 72-2004 72-2004Non-Metallic Washer (Accessory Drive Pad) 72-2005 72-2005Accessory Drive Housing (Improved Internal Oil Drains) 72-2016 72-2016Interstage Seal and Seal Support 72-2030 or

72-2031Turbine Bearing 72-2054 72-2054Fuel Control Assembly A73-0254 A73-0254Fuel Shutoff Valve 73-0208Inlet Temperature and Pressure Sensor Fittings 73-0235Oil Filter Element 79-0014 79-0014Oil Supply Tube Bracket Location 79-0031


Page 36TPE331-72-0476Dec 15/84



2. I. (2) Required Engine and Component Maintenance Actions for TBO Operation

CAUTION: DO NOT EXCEED CYCLE LIFE LIMITS SPECIFIED INPARAGRAPH 2.D. REGARDLESS OF ENGINE OPERATINGHOURS.

SOME WOODWARD FUEL CONTROLS REQUIREDIAPHRAGM REPLACEMENT IN ACCORDANCE WITHSERVICE BULLETIN TPE331-73-0207.

NOTE: Replace bearings in accordance with Table 1.

Replace certain splined spur gearshafts (Bull Gear) at intervalsspecified in Paragraph 2.E.

Scheduled inspections specified in Table 2/2A/2B, and the EngineMaintenance Manual must be accomplished in addition to thefollowing.

Scheduled component inspections specified in the EngineMaintenance Manual must be accomplished in addition to thefollowing.

Component overhaul intervals listed below are based oncomponent operating hours.

Make sure that the Component Maintenance/Modification RecordCard is updated at time of component removal/overhaul.

Except for fuel control assemblies, Honeywell furnished accesso-ries mounted on the engine have the same TBO as the engine. Honeywell furnished electronic components, remotely mountedfrom the engine, may remain in service as long as they are func-tionally tested and perform as prescribed in the Engine Mainte-nance Manual at the time of engine overhaul. These remotely-mounted electronic components require overhaul or replacementonly if found unacceptable when functionally tested.

If a Component Overhaul Manual is not procurable for acomponent, return the component to Honeywell for overhaul.


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2. I. (3) Make an entry in the engine log book noting date of compliance, engine operating time(and serial number of installed component if applicable) and compliance with thisservice bulletin (and service bulletin revision number).

In addition to making engine log book entries indicating maintenance actions andcompliance with individual service bulletins, make an engine log book entry confirmingengine configuration compliance with this service bulletin with respect to its TBOinterval.

Example: “Engine is configured for XXXX hour TBO operation in accordance with SBTPE331-72-0476 Rev 27.”

Table 4. Maintenance Requirements For 3000 and 5000 Hour TBO Intervals Overhaul Interval Maintenance Action

2900 to 3100 Hours Replace certain splined spur (bull) gearshafts at intervals specified infor 3000 Hour TBO Paragraph 2.E. of this service bulletin. or Overhaul/Replace Fuel Control Assembly.4900 to 5100 Hoursfor 5000 Hour TBO Overhaul/Replace Fuel Pump Assembly.for 5000 Hour TBO

Overhaul/Replace Fuel Shutoff Valve Assembly.

Overhaul/Replace Propeller Governor Assembly.

Overhaul/Replace Propeller Pitch Control Assembly.

Overhaul/Replace Torque/Temperature Limiter Bypass Valve.

Overhaul and functional test engine in accordance with the Engine OverhaulManual. Except for fuel control assemblies, Honeywell furnished accessoriesmounted on the engine have the same TBO as the engine. Honeywell fur-nished electronic components, remotely mounted from the engine, may remainin service as long as they are functionally tested and perform as prescribed inthe Engine Maintenance Manual at the time of engine overhaul. Theseremotely-mounted electronic components require overhaul or replacement onlyif found unacceptable when functionally tested.


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2. J. (Commercial Operation) Time Between Overhaul (TBO) and Continuous AirworthinessMaintenance (CAM) Requirements

NOTE: Engine Models TPE331-12B-701A/-702A/-703A are only approved for3000 hour TBO.

Engine Model TPE331-12JR-701C is only approved for 3000 and 5000hour TBO.

The 7000 hour TBO and CAM intervals supersede the 6000 hour TBOand CAM intervals previously specified.

A company/corporation operating to FAR Part 121 or 135 (or appropriate equivalent airworthi-ness authority), and conducting either scheduled or on-demand approved commercial opera-tion may be approved for TBO or CAM intervals of 7000 hours by their local FAA Flight Stan-dards District Office (FSDO) or the appropriate equivalent airworthiness authority. Engineperformance should be consistent with approved aircraft operational requirements.

Operating to a TBO or CAM interval of 7000 hours requires compliance with service bulletinslisted in Table 5 or 6 and maintenance actions listed in Table 7. Operation in excess of themaintenance action hourly limits listed in Table 7 is not approved by the engine manufacturer.

The service bulletins in Table 5 or 6 must be complied with at the next engine overhaul orCAM inspection based on the currently elected TBO or CAM interval, or within 9 years sincelast access to affected parts, whichever occurs first.

Honeywell furnished accessories which require overhaul under both the TBO and CAMprograms are listed in Table 7.

Service Bulletins listed in Table 5 or 6 may not be applicable to all engine models listed. Refer to Section 1.A. of each individual service bulletin to determine engine applicability.

Some engines are not listed in the effectivity section of some service bulletins because theywere shipped “first unit” in the post service bulletin configuration. These engines are requiredto be maintained in the post service bulletin configuration, even though they are not listed inthe service bulletin.

The configuration requirements and maintenance actions specified in Tables 6 and 7 underCAM are the minimum requirements for the Continuous Airworthiness Maintenanceprogram. Additional requirements or changes to the maintenance intervals specified in thisservice bulletin may be accomplished by the operator only with the approval of their local FAAFSDO or appropriate equivalent airworthiness authority. When requested by operators,Honeywell will provide assistance as necessary.


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2. J. (1) (Commercial Operation) Engine Configuration Requirements (Service Bulletin Require-ments) for TBO or CAM Operation.

CAUTION: ALL APPLICABLE ALERT SERVICE BULLETINS MUST BECOMPLIED WITH. REFER TO EACH INDIVIDUAL ALERTSERVICE BULLETIN FOR COMPLIANCE REQUIREMENTS.

SERVICE BULLETINS LISTED IN TABLE 5 OR 6 ARE THEMINIMUM REQUIREMENTS.

Revision of this service bulletin may have introduced new service bulletins, in Table 5or 6, not previously required for a particular engine model and TBO or CAM interval.Except for alert service bulletins, any new service bulletin added to Table 5 or 6 mustbe complied with at the next engine overhaul or CAM inspection based on the currentlyelected TBO or CAM interval, or within 9 years since last access to affected parts,whichever occurs first.

All applicable alert service bulletins, including those not specified in Table 5 or 6, mustbe complied with according to their respective compliance schedules.

Compliance with a service bulletin which supersedes one listed in Table 5 or 6 willsatisfy requirements for the specific TBO or CAM interval, even though the servicebulletin is not listed in Table 5 or 6.

Table 5. (Commercial Operation) Minimum Service Bulletin Requirement for TBO

TBO Intervals –––––––––––––––––––––––––––––––––––––––––> 7000 with GBI7000 without

GBI


Oil Transfer Tube 72-0736 72-0736

Notched Spacer/Spring Washer 72-0751 72-0751

Accessory Drive Housing (Insert and Packing) 72-0763 72-0763

Replace Aft Curvic Coupling 72-0774 72-0774

Increased Impeller Clearances 72-0781 72-0781

Second Stage Turbine Components 72-0788 72-0788

Propeller Governor Assembly (Speeder Spring and Reset Piston) 72-0789 72-0789

Turbine Bearing Retainer 72-0802 72-0802

Torque Load Assembly 72-0818 72-0818

Propeller Shaft Coupling 72-0871 72-0871

Oil Pressure Pump 72-0952 72-0952

Turbine Main Shaft Nut 72-0935 72-0935

Propeller Pitch Control Assembly 72-0958 and72-0968

72-0958 and72-0968

Turbine Scavenge Oil Pump Gasket 72-0962 72-0962

Diaphragm Gasket 72-2084 72-2084

Nose Cone Gasket 72-0966 72-0966


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Table 5. (Commercial Operation) Minimum Service Bulletin Requirement for TBO (Cont)

TBO Intervals –––––––––––––––––––––––––––––––––––––––––>7000 without

GBI7000 with GBI


Oil Scavenge Pump (Turbine) 72-2074 72-2074

P3 Gasket 72-2000 72-2000

First Stage Turbine Nozzle Components 72-2002 72-2002

Compressor Seals 72-2003 72-2003

Non-Metallic Washer (Starter/Generator Drive Pad) 72-2004 72-2004

Non-Metallic Washer (Accessory Drive Pad) 72-2005 72-2005

Accessory Drive Housing (Improved Internal Oil Drains) 72-2016 72-2016

Interstage Seal and Seal Support 72-2030 or72-2031

72-2030 or72-2031

Turbine Bearing 72-2054 72-2054

Fuel Control Assembly A73-0254 A73-0254

Fuel Shutoff Valve 73-0208 73-0208

Inlet Temperature and Pressure Sensor Fittings 73-0235 73-0235

Oil Filter Element 79-0014 79-0014

Oil Supply Tube Bracket Location 79-0031 79-0031


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Table 6. (Commercial Operation) Minimum Service Bulletin Requirement for CAM

TBO Intervals ––––––––––––––––––––––––––––––––––––––––> 7000 with GBI7000 without

GBI


Oil Transfer Tube 72-0736 72-0736

Notched Spacer/Spring Washer 72-0751 72-0751

Accessory Drive Housing (Insert and Packing) 72-0763 72-0763

Replace Aft Curvic Coupling 72-0774 72-0774

Increased Impeller Clearances 72-0781 72-0781

Second Stage Turbine Components 72-0788 72-0788

Propeller Governor Assembly (Speeder Spring and Reset Piston) 72-0789 72-0789

Turbine Bearing Retainer 72-0802 72-0802

Torque Load Assembly 72-0818 72-0818

Propeller Shaft Coupling 72-0871 72-0871

Turbine Main Shaft Nut 72-0935 72-0935

Oil Pressure Pump 72-0952 72-0952

Propeller Pitch Control Assembly 72-0958 and72-0968

72-0958 and72-0968

Turbine Scavenge Oil Pump Gasket 72-0962 72-0962

Diaphragm Gasket 72-2084 72-2084

Nose Cone Gasket 72-0966 72-0966

Oil Scavenge Pump (Turbine) 72-2074 72-2074

P3 Gasket 72-2000 72-2000

First Stage Turbine Nozzle Components 72-2002 72-2002

Compressor Seals 72-2003 72-2003

Non-Metallic Washer (Starter/Generator Pad) 72-2004 72-2004

Non-Metallic Washer (Accessory Drive Pad) 72-2005 72-2005

Accessory Drive Housing (Improved Internal Oil Drains) 72-2016 72-2016

Interstage Seal and Seal Support 72-2030 or72-2031

72-2030 or72-2031

Turbine Bearing 72-2054 72-2054

Fuel Control Assembly A73-0254 A73-0254

Fuel Shutoff Valve 73-0208 73-0208

Inlet Temperature and Pressure Sensor Fittings 73-0235 73-0235

Oil Filter Element 79-0014 79-0014

Oil Supply Tube Bracket Location 79-0031 79-0031


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2. J. (2) (Commercial Operation) Required Engine and Component Maintenance Actions forTBO and CAM Operation

CAUTION: DO NOT EXCEED CYCLE LIFE LIMITS SPECIFIED INPARAGRAPH 2.D. REGARDLESS OF ENGINE OPERATINGHOURS.

SOME WOODWARD FUEL CONTROLS REQUIREDIAPHRAGM REPLACEMENT IN ACCORDANCE WITHSERVICE BULLETIN TPE331-73-0207.

NOTE: Replace bearings in accordance with Table 1.

Replace certain splined spur gearshafts (Bull Gear) at intervalsspecified in Section 2.E.

Scheduled inspections specified in Tables 2A and 2B and theEngine Maintenance Manual must be accomplished in addition tothe following.

Scheduled component inspections specified in the EngineMaintenance Manual must be accomplished in addition to thefollowing.

Component overhaul intervals listed below are based oncomponent operating hours.

Make sure that the Component Maintenance/Modification RecordCard is updated at time of component removal/overhaul.

(TBO Engines) Except for fuel control assemblies, Honeywellfurnished accessories mounted on the engine have the same TBOas the engine. Honeywell furnished electronic components,remotely mounted from the engine, may remain in service as longas they are functionally tested and perform as prescribed in theEngine Maintenance Manual at the time of engine overhaul.These remotely-mounted electronic components require overhaulor replacement only if found unacceptable when functionallytested.

If a Component Overhaul Manual is not procurable for acomponent, return the component to Honeywell for overhaul.

(CAM Engines) Honeywell furnished electronic components,remotely mounted from the engine, may remain in service as longas they are functionally tested and perform as prescribed in theEngine Maintenance Manual at the time of engine CAM. Theseremotely-mounted electronic components require overhaul orreplacement only if found unacceptable when functionally tested.


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2. J. (3) Make an entry in the engine log book noting date of compliance, engine operating time(and serial number of installed component if applicable) and compliance with thisservice bulletin (and service bulletin revision number).

In addition to making log book entries indicating maintenance actions and compliancewith individual service bulletins, make an entry in the engine log book confirmingengine configuration and compliance with this service bulletin with respect to its TBO orCAM interval.

Example: “Engine is configured for 7000 hour TBO operation in accordance with SBTPE331-72-0476 Rev 27.” or, “Engine is configured for CAM operation in accordancewith SB TPE331-72-0476 Rev 27.”

Table 7. (Commercial Operation) Maintenance Requirements For 7000 Hour TBO or CAM Intervals

Overhaul/CAM Interval Maintenance Action

All Replace certain splined spur (bull) gearshafts at intervals specified inParagraph 2.E. of this service bulletin.

(All) Every 5900 to6100 Hours

(Pre SB TPE331-A73-0254) Overhaul/Replace Fuel Control Assembly.

6900 to 7100 Hour Reduction Gear SectionCAM Interval Completely disassemble the Reduction Gear Section and accomplish a

Gearbox Inspection in accordance with the Engine Maintenance Manual.

Refer to SB TPE331-A72-2087 and TPE331-A72-2093.

Compressor Section

Inspect in accordance with the Engine Maintenance Manual.

Turbine (Hot) Section

Inspect in accordance with the Engine Maintenance Manual.

(All) Every 6900 to7100 Hours

(Post SB TPE331-A73-0254 and TPE331-12JR-701S) Overhaul/ReplaceFuel Control Assembly.

Overhaul/Replace Fuel Pump Assembly.

Overhaul/Replace Fuel Shutoff Valve Assembly.

Overhaul/Replace Propeller Governor Assembly.

Overhaul/Replace Propeller Pitch Control Assembly.

Overhaul/Replace Torque/Temperature Limiter Bypass Valve.


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Table 7. (Commercial Operation) Maintenance Requirements For 7000 Hour TBO or CAM Intervals (Cont)

Overhaul/CAM Interval Maintenance Action

6900 to 7100 HourTBO Interval

Overhaul and functional test engine in accordance with the Engine OverhaulManual. Except for fuel control assemblies, Honeywell furnished accessoriesmounted on the engine have the same TBO as the engine. Honeywell fur-nished electronic components, remotely mounted from the engine, may remainin service as long as they are functionally tested and perform as prescribed inthe Engine Maintenance Manual at the time of engine overhaul. Theseremotely-mounted electronic components require overhaul or replacement onlyif found unacceptable when functionally tested.

6900 to 7100 HourCAM Interval

Functional test engine in accordance with the Engine Maintenance Manual.Honeywell furnished electronic components, remotely mounted from the en-gine, may remain in service as long as they are functionally tested and performas prescribed in the Engine Maintenance Manual at the time of engine CAM.These remotely-mounted electronic components require overhaul or replace-ment only if found unacceptable when functionally tested.


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2. K. Inspection Interval Extension

A company/corporation operating to FAR Part 121 or 135 (or appropriate equivalent airworthi-ness authority), and conducting either scheduled or on-demand approved commercial opera-tion which has been approved for 7000 hour TBO, may extend the inspection/overhaul inter-vals after a successful engine sampling evaluation and approval of their local FAA FSDO orappropriate equivalent airworthiness regulatory agency.

CAUTION: SOME WOODWARD FUEL CONTROLS REQUIRE DIAPHRAGMREPLACEMENT IN ACCORDANCE WITH SERVICE BULLETINTPE331-73-0207.

NOTE: (Pre SB TPE331-A73-0254) Woodward fuel control overhaul intervalmay be extended past 6100 hours if approved by Woodward GovernorCompany and local FAA or appropriate equivalent airworthiness regula-tory agency.

Fuel Shutoff Valve, Part No. 394230-9-1, overhaul interval may beextended past 7100 hours if approved by local FAA or appropriateequivalent airworthiness regulatory authority.

(1) Candidate sample engines must satisfy the following requirements.

(a) The candidates should be from a true random sampling to establish a typicalprofile of engine condition for the operator’s fleet.

(b) The engine should be within �100 hours�of the scheduled interval.

(c) To establish a “typical” profile, the engine should have operated its entire pre-vious maintenance interval while with the same airline, and be representative ofthe airline’s scheduled operations.

(d) The engine must not have had any major component replaced in the area of theengine being subjected to the interval extension program during the recent main-tenance interval.

(e) The engine log books and/or engine maintenance history should be thoroughlyreviewed by the operator. Any premature or unscheduled maintenance on acandidate engine must be noted and discussed in the airline’s written intervalextension program.

(2) Following successful evaluation of three (3) sample engines at the present interval, andlocal regulatory approval, the inspections/overhauls required at 3500 and 7000 hoursmay have intervals extended up to 500 and 1000 hours, respectively, beyond the pres-ent interval.

(3) The process of Section 2.K. may be repeated for additional extensions.


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3. Material Information

Not Applicable

Documents

SERVICE BULLETIN - 850 Caravan SB - TIME LIMITED PARTS.pdf · The tabulation of maintenance intervals as set out in this service bulletin is approved by the engine manufacturer,