Installation of the Ignition Exciter [CFMB]

TASK 74-11-10-400-002-A
Installation 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	PLIERS - NOSE, SOFT, LONG
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )
No specific	Torque wrench: range to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease

C. Work Zones and Access Panels

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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-B	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-B	Closing of the Fan Cowl Doors
TASK 74-00-00-710-043-A	Operational Test of the Ignition System
TASK 74-00-00-710-043-A-01	Operational Test of the Ignition System without CFDS
Ignition Exciters

3. Job Set-up
Subtask 74-11-10-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) On the center pedestal, on the ENG panel 115VU, make sure that a WARNING NOTICE(S) is in position to tell persons not to start the engine.
(2) On the overhead maintenance panel 50VU, make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 74-11-10-010-057-A ** ON A/C NOT FOR ALL

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

Subtask 74-11-10-865-058-A ** ON A/C NOT FOR ALL

C. 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: 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

4. Procedure
Subtask 74-11-10-420-052-A ** ON A/C NOT FOR ALL

A. Install the Upper and Lower Ignition Exciters:
(1) Apply a thin layer of graphite grease (Material No.CP2101) on the threads and friction surface of the studs (10).
(2) Install the upper ignition exciter (50) on the upper studs (10) and the lower ignition exciter (110) on the lower studs (10).
(3) Place the end of the ground strap (80) on the nearest stud (10). The ground strap (80) is installed between the washer (30) and the ignition exciter (50), (110).
(4) Install the washers (30) and nuts (20) as follows:
(a) Put the washers (30) on the studs (10). Make sure the ground strap (80) is between the washers (30) and the ignition exciter (50), (110).
(b) Install the nuts (20). Do not let the stud (10) turn in the resilient mount (150). Hold the stud (10) with an open-end wrench. The wrench flats (160) are locate between the resilient mount (150) and the ignition exciter (50), (110).
(c) TORQUE the nuts (20) to between 70 and 55 lbf.in (0.79 and 0.62 m.daN )

. Hold the stud (10) and turn the nut (20).

Subtask 74-11-10-420-054-A ** ON A/C NOT FOR ALL

B. Connection of the Ignition Leads and Power Supply Cables:
(1) Remove the blanking caps from the disconnected electrical connectors, power supply cables and ignition leads.
(2) Connect the right-side ignition lead (140) to the electrical input connector (40) on the aft side of the upper ignition exciter (50).
(3) Connect the left-side ignition lead (130) to the electrical input connector (120) on the aft side of the lower ignition exciter (110).
(4) TORQUE the connector nuts of the ignition exciter (140), (130) to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

.
(5) Connect the upper power supply cable (70) to the electrical input connector (60) on the forward side of the ignition exciter (50).
(6) Connect the lower power supply cable (90) to the electrical input connector (100) on the forward side of the ignition exciter (110).
(7) Tighten the connector nuts of the power supply cables (70), (90) with your hand, plus one-eight of a turn. If necessary, use PLIERS - NOSE, SOFT, LONG.

Subtask 74-11-10-865-059-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close 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 74-11-10-710-052-A ** ON A/C NOT FOR ALL

D. Perform an operationnal test of the ignition system (Ref. AMM TASK 74-00-00-710-043).

5. Close-up
Subtask 74-11-10-410-053-A ** ON A/C NOT FOR ALL

A. Close Access
(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 71-13-00-410-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:07:26 UTC