Removal of the Ignition Exciter [IAE]

TASK 74-11-38-000-010-A
Removal of the Ignition Exciter

WARNING: DO NOT TOUCH THE IGNITION EXCITER FOR AT LEAST ONE MINUTE AFTER THE APPLICABLE CIRCUIT BREAKERS ARE OPEN. THE ELECTRICAL DISCHARGE OF THE HIGH ENERGY UNIT IS DANGEROUS AND CAN KILL.

CAUTION: DO NOT BEND THE IGNITION LEAD TOO MUCH WHEN YOU DISCONNECT THE ELECTRICAL CONNECTOR. THE IGNITION LEAD CAN BE DAMAGED AND CAN CAUSE ELECTRICAL CIRCUIT DEFECTS.

FIN: 4000JH1 ** ON A/C NOT FOR ALL
FIN: 4000JH2 ** ON A/C NOT FOR ALL

1. Reason for the Job
There are two Ignition Exciters on each engine. This TASK gives the procedure to remove one Exciter. Use the same procedure to remove the second Exciter.
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, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
Ignition Exciter
Ignition Exciter

3. Job Set-up
Subtask 74-11-38-941-050-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 74-11-38-865-050-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 74-11-38-010-050-A ** ON A/C NOT FOR ALL

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

Subtask 74-11-38-040-051-A ** ON A/C NOT FOR ALL

D. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 74-11-38-010-051-A ** ON A/C NOT FOR ALL

E. Open the right thrust reverser half (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
452AR
(2) FOR [1000EM2] (ENGINE-2)
462AR

4. Procedure
Subtask 74-11-38-020-050-A ** ON A/C NOT FOR ALL

A. Remove the Ignition Exciter (5) and Ignition Cooler Box (9)

Ignition Exciter ** ON A/C NOT FOR ALL

(1) Loosen the clamp (3) and disconnect the air inlet hose (4) from the ignition cooler box (9).
(2) Disconnect the input lead (11).
(3) Disconnect the ignition lead (10)
(a) Loosen the clamps (13) and (15) and remove the cooling shroud (14).
(b) Disconnect the ignition lead (10) from the ignition exciter (5).
(c) Remove and discard the grommet (12).
(4) Hold the ignition cooler box (9) and remove the nuts (1) and the bolts (6). Remove the ignition cooler box (9) with the ignition exciter (5).

Subtask 74-11-38-020-051-A ** ON A/C NOT FOR ALL

B. Removal of the Ignition Cooler Box Halves and Air Seal Washer

Ignition Exciter ** ON A/C NOT FOR ALL

PRE SBE 74-0002

PRE SBE 74-0003

(1) Remove the ignition cooler box halves (9) and the air seal washer (8) from the ignition exciter (5).
(2) Install CAP - BLANKING on all openings.

Subtask 74-11-38-020-052-A ** ON A/C NOT FOR ALL

C. Remove the ignition exciter (5).

Ignition Exciter ** ON A/C NOT FOR ALL

SBE 74-0002 : Improved ignition lead, cooling shroud and ignition cooling box.

PRE SBE 74-0003

(1) Remove the twelve locking washer nuts (16) and the two support brackets from the ignition cooler box (9).
(2) Remove the ignition cooling box halves (9) and the air seal washer (8) from the ignition exciter (5).
(3) Install CAP - BLANKING on all openings.

Subtask 74-11-38-020-053-A ** ON A/C NOT FOR ALL

D. Remove the ignition exciter (5).

Ignition Exciter ** ON A/C NOT FOR ALL

SBE 74-0003 : Redimensioned ignition lead cooling shroud and the deletion of the ignition cooling box support bracket.

(1) Remove the twelve locking washer nuts (16) from the ignition cooler box (9).
(2) Remove the ignition cooling box halves (9) and the air seal washer (8) from the ignition exciter (5).
(3) Install CAP - BLANKING on all openings.

[Rev.10 from 2021] 2026.04.01 03:08:02 UTC