Installation of the Ignition Exciter [PW11]

TASK 74-11-01-400-801-A
Installation of the Ignition Exciter

WARNING: BEFORE YOU REMOVE/INSTALL IGNITION COMPONENTS:

WAIT FOR SOME MINUTES AFTER THE IGNITION SYSTEM IS USED
MAKE SURE THAT THE ENG/MODE SELECTOR SWITCH IS IN THE NORM POSITION.

AFTER YOU REMOVE THE IGNITER LEAD FROM THE IGNITER PLUG, IMMEDIATELY PUT THE IGNITION LEAD TERMINAL IN CONTACT WITH A GOOD GROUND TO LET ALL OF THE ELECTRICAL ENERGY OUT OF THE SYSTEM. THE IGNITION SYSTEM VOLTAGE IS VERY HIGH. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY OR DEATH CAN OCCUR.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

FIN: 4000JH ** ON A/C NOT FOR ALL

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	PLIERS - JAWED, SOFT
No specific	Torque wrench: range to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )
No specific	Torque wrench: range to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-832-A	Procedure to Prevent Engine Motoring and to Stop the Electrical Supply to the EEC
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 73-25-34-400-802-A	Installation of the Engine Interface Unit (EIU)
TASK 74-00-00-710-802-A	Operational Test of the Ignition System with the CFDS
Ignition Exciter

3. Job Set-up
Subtask 74-11-01-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring and to stop the electrical supply to the Electronic Engine Control (EEC)
(Ref. AMM TASK 71-00-00-860-832).

Subtask 74-11-01-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 74-11-01-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR

4. Procedure
Subtask 74-11-01-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Ignition Exciter

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

(1) Make sure that you remove all the necessary COVER - PROTECTION to prevent damage to the engine. and to prevent damage to the engine.
(2) Install the ignition exciter (1) to the fan case brackets as follows:
(a) Install the exciter (1) on the fan case brackets with the four bolts (3).
(b) TORQUE the four bolts (3) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )

.
(c) Attach the ground strap to the top fan case bracket with the bolt (2).
(d) TORQUE the bolt (2) to between 44 and 38 lbf.in (0.50 and 0.43 m.daN )

.
(e) Connect the ignition cables.

CAUTION: DO NOT TWIST THE IGNITION CABLE WHEN YOU TURN THE COUPLING NUT. THIS COULD DAMAGE THE CABLE.

1 Connect the ignition cables A and B to the exciter receptacles.
(f) Torque the B-nuts of the both ignition cables A and B.

CAUTION: BE SURE TO TIGHTEN IGNITION CONNECTOR NUTS TO THE CORRECT TORQUE. IF THE TORQUE AT EITHER THE IGNITOR PLUG OR IGNITION EXCITER END OF THE CABLE IS NOT SUFFICIENT, THIS CAN CAUSE ELECTRICAL NOISE FROM THE IGNITION SYSTEM IN THE AIRCRAFT RADIO EQUIPMENT.

1 TORQUE the ignition cables nuts (A and B) to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

.
(3) Connect the wiring harness (W03) connector (P66) to the exciter receptacle (J66) as follows:
(a) Examine, align and engage the connector.
(b) Push lightly inward on the connector while you tighten the coupling ring.
(c) Use the PLIERS - JAWED, SOFT and tighten the connector against the receptacle.
(d) Make sure that you can feel the ratchet feature.
(e) While you tighten, push the connector in and from side to side.
(f) Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(4) Connect the wiring harness (W04) connector (P67) to the exciter receptacle (J67) as follows:
(a) Examine, align and engage the connector.
(b) Push lightly inward on the connector while you tighten the coupling ring.
(c) Use the PLIERS - JAWED, SOFT and tighten the connector against the receptacle.
(d) Make sure that you can feel the ratchet feature.
(e) While you tighten, push the connector in and from side to side.
(f) Tighten the connector until the PLIERS - JAWED, SOFT slip on the connector ring.
(5) Examine the assembly for unwanted objects, damage and correct assembly.

5. Close-up
Subtask 74-11-01-410-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

Subtask 74-11-01-865-052-A ** ON A/C NOT FOR ALL

B. Remove the safety clip(s) and tag(s) and close this (these) circuit breaker(s) (circuit breaker(s) with orange extension caps) :

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 74-11-01-720-050-A ** ON A/C NOT FOR ALL

C. Tests
(1) Make sure that all the circuit breakers shown in the paragraph Procedure of the engine interface unit installation are closed. If they are not, close them in the recommended sequence
(Ref. AMM TASK 73-25-34-400-802).
(2) Do the operational test of the ignition system (Ref. AMM TASK 74-00-00-710-802).

[Rev.10 from 2021] 2026.04.02 06:36:49 UTC