Removal of the Ignition Exciter [CFMB]

TASK 74-11-10-000-002-A
Removal of the Ignition Exciter

WARNING: BEFORE YOU START WORK ON THE IGNITION SYSTEM, MAKE SURE THAT THE IGNITION EXCITERS ARE DE-ENERGIZED FOR A MINIMUM OF FIVE MINUTES. ALSO DO NOT TOUCH THE ELECTRICAL CONTACTS. THE IGNITION SYSTEM VOLTAGE IS VERY HIGH, AND THE IGNITION EXCITERS CAN HAVE AN ELECTRICAL CHARGE EVEN WHEN NOT ENERGIZED. IF YOU DO NOT OBEY THESE PRECAUTIONS, INJURY CAN OCCUR.

FIN: 4000JH1 ** ON A/C NOT FOR ALL
FIN: 4000JH2 ** 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	AR	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
Ignition Exciters

3. Job Set-up
Subtask 74-11-10-941-053-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 74-11-10-865-057-A ** ON A/C NOT FOR ALL

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 1000EM1 (ENGINE1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
121VU	ENGINE/IGN/ENG1/SYS A BAT	2JH1	P39
FOR FIN: 1000EM2 (ENGINE2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42
121VU	ENGINE/IGN/ENG2/SYS A BAT	2JH2	P40

Subtask 74-11-10-010-054-A ** ON A/C NOT FOR ALL

C. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR

4. Procedure
Subtask 74-11-10-020-053-A ** ON A/C NOT FOR ALL

A. Disconnect the Power Supply Cables and the Ignition Leads as Follows:
(1) Disconnect the power supply cable (70), (90) from the electrical input connector (60), (100) on the forward side of the ignition exciter (50) , (110).
(2) Disconnect the ignition lead (140), (130) from the ignition lead connector (40), (120) on the aft side of the ignition exciter (50), (110).
(3) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.

Subtask 74-11-10-020-054-A ** ON A/C NOT FOR ALL

B. Remove the nuts (20) and the washers (30) as follows:
(1) Do not let the stud (10) turn in the resilient mount (150). Hold the stud (10) with an open-end wrench. The stud flats (160) are located on the resilient mount (150) and the ignition exciter (50), (110).
(2) Remove the nuts (20) and the washers (30). Hold the stud (10) by the flats (160) and turn the nuts (20).
(3) Remove the ground straps (80) located at the forward end of the ignition exciter (50), (110).
(4) Remove the ignition exciters (50), (110).

[Rev.10 from 2021] 2026.04.01 13:07:51 UTC