Removal of the Ignition Exciter [PW11]

TASK 74-11-01-000-801-A
Removal 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	COVER - PROTECTION
No specific	1	PLIERS - JAWED, SOFT

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
Ignition Exciter

3. Job Set-up
Subtask 74-11-01-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do 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 74-11-01-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag these circuit breakers in this sequence:

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 74-11-01-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (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 74-11-01-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Ignition Exciter

WARNING: USE NECESSARY PRECAUTIONS WHEN YOU DO WORK ON THE ENGINE IGNITION SYSTEM. THIS SYSTEM HAS HIGH ENERGY AND CAN CAUSE INJURY OR DEATH BY ELECTRICAL SHOCK.

(1) Make sure that you wipe clean all the parts and tools to remove contamination and to prevent damage to the engine.
(2) Find the exciter (1) attached to the fan case assembly at the 5 o'clock position.
(3) Remove the exciter (1) from the fan case brackets as follows:
(a) Disconnect the wiring harness (W03) and (W04) connectors (P66) and (P67) from the exciter (1) with the PLIERS - JAWED, SOFT.
(b) Disconnection of the ignition cables

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

1 Disconnect the ignition cables A and B.
(c) Remove the bolt (2) that attaches the ground strap to the top fan case bracket.
(d) Remove the four bolts (3) that attach the exciter (1).
(e) Remove the exciter (1).
(4) Installation of protection covers

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Make sure that you install COVER - PROTECTION as necessary to prevent damage to the engine.

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