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8/20/2019 report aircraft elctrical system.docx http://slidepdf.com/reader/full/report-aircraft-elctrical-systemdocx 1/12 OBJECTIVES  To understand the usage of aircraft maintenance manuals.  To ensure the selections of appropriate tools during the removal and installation of aircraft components.  Student needs to identify and follow the safety precaution during the process of component removal and installation. TOOLS REQUIRED Set of Sockets Wire Cutter  Set of Spanners Multimeter  Wire Twister Meter Rule  Torque Wrench “ C Spanner 

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OBJECTIVES

  To understand the usage of aircraft maintenance manuals.

  To ensure the selections of appropriate tools during the removal and

installation of aircraft components. 

Student needs to identify and follow the safety precaution during the process

of component removal and installation.

TOOLS REQUIRED

Set of Sockets Wire Cutter 

 

Set of Spanners Multimeter 

 

Wire Twister Meter Rule

 

Torque Wrench “ C Spanner 

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!hilip screw driver Torch light

 

Step down socket adapter 

REFERENCES

• "S#$%&'(() maintenance manual chapter $' * $+

STARTER GENERATOR INSPECTION

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SYSTEM OPERATION

  ,ircraft starter generator -asically a dc generator that can -e used as

starter motor 

 

uring starting/ the -attery power is connected to the starter&gen. 0t will -ecome a motor and crank the engine

  ,t certain speed/ the -attery will disengage and it will -e riven -y the

engine and turn to generator 

PROCEDURE TO REMOVE STARTER GENERATOR 

#. 0solate relevant electrical circuits 1 chapter $'/ 2eneral 3

$. 4pen -ottom engine cowls.+. isconnect starter 5 generator cooling air inlet hose.

'. isconnect -reather hose from -ottom front coil. 1right engine& 6one M$3

%. Remove -ottom cowl.

7. Remove overheat switch from stater generator 1chapter $'/ 2enerator

4verheat Switch3

8. isconnect electrical ca-les from starter 5 generator.

WARNING 9 ST,RT:R 5 2:;:R,T4R W:02"T ,!!R4<. %'=).

>. Support weight of starter 5 generator/ release clamp ring and report starter 5

generator 

Picture of t!rter "e#er!tor !fter $ei#" re%o&e

INSPECTION OF T'E CARBON BRUS'

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#. Remove -rush gear cover -and.

$. Remove the two suppressor -o? cover/ secured -y slot headed screw.

+. isconnect lead from terminal on choke assem-ly.

'. isconnect leads from the small capacitors on either side of choke

assem-ly.

%. Slacken the two screws securing the suppressor tray saddle to the field

coil yoke.

7. Slide complete suppressor -o? assem-ly toward the -rushgear end of the

unit and carefully lift clear.

8. Withdraw -rushes from holders and measure the length of the longest

side of each pair -rushes. 0f this measurement is #.## inch or a-ove/ the

 -rushes may -e fitted for a futher routine check period.

>. 0f the measurement is less then #.## inch/ the -rushes may -e refitted -ut

must -e renewed -efore the minimum -rush length of (.>% inch has -een

reached.

INSPECTIONS ON CARBON BRUS'

 

INSTALLATION OF STARTER GENERATOR 

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#. Make sure that the gear-o? e?tension drive shaft grease sleeve is

lu-ricated with clean approved lu-ricant. 0f necessary/ wash out all

trace of old contaminated using white spirit and dry off with clean

compress air. !ack the e?tension drive shaft grease sleeve with

approved fresh lu-ricant.

$. Make sure that the starter generator locating dowel holes in the engine

air outlet casing are clean and that mounting flanges and clamping

surfaces are free from -urrs and foreign matter.

+. =u-ricate thread of clamp ring -olt/ inside faces of clamp ring/ and

starter generator splines with grease. =u-ricate and fit new o&ring seal

to starter generator drives shaft shroud.

'. 4ffer out starter generator/ check that mounting flange mate and fully

engage starter generator with engine gear-o?.

%. @it starter generator clamp ring/ and torque tighten -olt to #$( l- inch/

loosen and re&torque to #$( l- inch. Repeat sequence until -olt ceases

to advance. When finally torqued to correct loading the gap -etween

clamp end must -e (.(%$ inch to (.$>% inch.

7. Connect and secure electrical ca-les to starter generator.

8. Connect and secure overheat switch electrical leads to terminal -lock

== or M=.

>. @it -ottom front cowl.

A. Connect and secure starter generator air cooling inlet hose.

#(. Connect and secure the -reather hose to -ottom front cowl.

##. Close and secure all cowls

#$. Restore all relevant electrical circuit

#+. @unctional test for starter generator -efore install into aircraft.

SAFETY PRECAUTIONS

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a3 Wear proper attire and use the right tools -efore removing and installing the

starter generator.

 -3 Starter generator weighs appro?imately %' =).

c3 0n the following operation ensure that fle?i-le pipe @.##&$$+ is not under

tension and does not foul the starter generator.

d3 Care must -e taken not to damage drive end sealing ring/ when fitting starter

generator to engine.

e3 =ocate -ottom front cowl and check alignment of air inlet prior to torque

loading.

f3 =eft&hand starter generator only/ ensures that the ca-le terminal lugs do not foul

the cowling.

DEFECT

• Stand on M$ cowling missing

• Ca-el on car-on -rush # worn out

• Suppresser -o? cover have a lot of corrosion

• Two screw missing

• Wire at voltage regulator missing

ACTION

  @itted stand at M$ cowling

  Replaced ca-el of car-on -rush #

 

Replaced -o? cover   Replaced the missing screw

  0nstalled new wire at voltage regulator 

CIRCUIT BREA(ER INSPECTIONS

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SBST:M 4!:R,T04;

• 0t is commonly used in aircraft to protect the circuit from e?cessive current

0t is resetta-le once the circuit is cools• ,ircraft circuit -reakers are trip&free type which means that once the -reaker 

opens/ the circuit remains open until the circuit cools regardless of the

 position of the operating control.

• Circuit -reakers operate on either thermal or magnetic principles.

• Thermal -reakers open a circuit when e?cess current heats an element in the

 -reaker causing the contacts to open.

• Magnetic -reakers utili6e the magnetic field caused -y the current in the

circuit to open the contacts

PROCEDURE

#. @irst/ shut down all aircraft electrical system.

$. Remove two circuit -reaker with different ampere.

+. Check continuity using multimeter 1analogue3.

 

!icture of circuit -reaker 

SAFETY PRECAUTION

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a3 :nsure power supply has -een removed -efore remove the circuit -reakers.

 -3 :nsure that the circuit -reakers that has -een removed must -e tag to ensure

correct location when installing the -reakers.

c3 0f the circuit -reakers need to -e replace/ ensure that circuit -reakers must -ecorrect current rating as -efore.

Defect

 

Contacter damage

  Circuit -reaker is not connected with wire

Actio#

 

Replaced the circuit -reaker   Connect the wire to the circuit -reaker contacter 

BATTERY INSPECTIONS

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SBST:M 4!:R,T04;

• The "awker $'&volts $%&,h lead&acid -attery is a sealed/ valve regulated

system which allows the -attery to -e oriented and operated in any attitude

or position without spillage of electrolyte• 0t comprises two #$&volts sealed mono&-locks connected in series/ which are

tightly enclosed in a polyester -onded fi-er glass which incorporates the

 -attery main terminal connector.

• :ach mono&-locks incorporates a resealing safety valve to guard against the

effects of a-usive use of the -attery.

• The mono&-locks are e?ternally connected -y multiple copper strip

lamination and to the main -attery terminals.

PROCESS OF REMOVING T'E BATTERY

• disconnect venting pipes

•  disconnect -attery connector 

•  release wing -olt securing -attery mounting tray assem-ly to -attery shelf 

•  remove -attery from -attery mounting tray

INSPECTIONS

  :nsure the -attery trays are clean/ and drip tray -locks and pad are securely

 -onded in position

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• Remove -attery hold&down cover/ and check that the -attery vent plugs are

secure and free from o-struction.

PROCESS OF INSTALLING T'E BATTERY

• =ocate the -attery on drip tray in mounting tray assem-ly/ fit and tighten

wing -olts and locking nuts to secure -attery to tray assem-ly

• !osition the -attery complete with mounting tray assem-ly in the aircraft

ensuring that the dowels on mounting tray locate in holes in mounting

structure. Tighten wing -olt to secure.

• Connect and secure -attery connection.

• @it and secure -attery vent pipes.

•@unctionally test -attery supply circuit 1 see chapter $'/ C 2:;:R,T4R 3

DEFECTS

  )attery terminal connector corrode

  )attery terminal ingress or dirt

  )attery venting pipe damage

ACTIONS

  Replaced the -attery terminal with new one

  Replace the venting pipe

CONCLUSIONS

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  Trainee must -e use appropriate tools during removal and installation of 

aircraft components.

  Safety precaution must -e identified and followed during the process of 

component removal and installation.

  :very defect must have its own action so that it can -e solved -efore the

aircraft is -eing released.

  :very maintenance work must -e done according to the maintenance

manual.

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 UNIVERSITY (UALA LUMPUR 

MALAYSIAN INSTITUTE OF AVIATION TEC'NOLOGY

PRACTICAL REPORT

'S )*+ COMPONENT REMOVAL AND INSTALLATION

 

INSTRUCTOR , Mr- F!i.!/ S0!riff 

TRAINEE , Mo01 S2!.3!# $i# F!1.i/ +4)+5)6764+

  , C0e Mo01 Fir1!u $i# C0e Mo01 '!#!fi +4)+5)67))8

, Mo0!%!1 Fir1!u $i# A1#!# +4)+5)676*)

CLASS , 9 'e/ico:ter

SUBJECT , Aircr!ft E/ectric!/ S2te%