Installation of the Ignition Exciter [IAE]

TASK 74-11-38-400-010-A
Installation of the Ignition Exciter

CAUTION: DO NOT BEND THE IGNITION LEAD TOO MUCH WHEN YOU CONNECT 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 install one Exciter. Use the same procedure to install the second Exciter.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )
No specific	Torque wrench: range to between 26 and 20 lbf.in (0.29 and 0.23 m.daN )
No specific	Torque wrench: range to between 45 and 36 lbf.in (0.51 and 0.41 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 [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

C. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
12	GROMMET	AIPC 74-21-43-80-020

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
TASK 70-23-15-912-010-A	Connection of Electrical Connectors
TASK 71-13-00-010-010-A	Opening of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 71-13-00-410-010-A	Closing of the Fan Cowls 437AL(447AL),438AR(448AR)
TASK 74-00-00-710-041-A	Operational Test of the Ignition System with the CFDS
TASK 74-00-00-710-041-A-01	Operational Test of the ignition System without the CFDS
TASK 78-30-00-040-012-A	Deactivation of the Thrust Reverser Hydraulic Control Unit (HCU) for Ground Maintenance
TASK 78-30-00-440-012-A	Re-activation of the Thrust Reverser Hydraulic Control Unit (HCU) after Ground Maintenance
TASK 78-32-00-010-010-A	Opening of the Thrust Reverser Halves
TASK 78-32-00-410-010-A	Closing of the Thrust Reverser Halves
Ignition Exciter
Ignition Exciter

3. Job Set-up
Subtask 74-11-38-860-050-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) is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).

Subtask 74-11-38-865-052-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: 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 74-11-38-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowls are open (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the right thrust reverser half is open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 74-11-38-040-050-A ** ON A/C NOT FOR ALL

D. Make sure that the thrust reverser Hydraulic Control Unit (HCU) is deactivated: (Ref. AMM TASK 78-30-00-040-012)

4. Procedure
Subtask 74-11-38-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Ignition Cooler Box and Air Seal Washer

Ignition Exciter ** ON A/C NOT FOR ALL

PRE SBE 74-0002

PRE SBE 74-0003

(1) Remove caps from all openings.
(2) Install the two parts of the ignition cooler box (9) and the air seal washer (8) on the ignition exciter (5).

Subtask 74-11-38-420-052-A ** ON A/C NOT FOR ALL

B. Install the ignition cooler box (9) on 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 caps from all openings.
(2) Install the two parts on the ignition cooler box (9) and the air seal washer (8) on the ignition exciter (5).
(3) Install the two support brackets (17) and the twelve locking washer nuts (16) on the ignition cooler box (9).
(4) TORQUE the locking washer nuts (16) to between 26 and 20 lbf.in (0.29 and 0.23 m.daN )

Subtask 74-11-38-420-053-A ** ON A/C NOT FOR ALL

C. Install the ignition cooler box (9) on 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 caps from all openings.
(2) Install the two parts of the ignition cooler box (9) and the air seal washer (8) on the ignition exciter (5).
(a) Install the twelve locking washer nuts (16) on the ignition cooler box (9).
(b) TORQUE the locking washer nuts (16) to between 26 and 20 lbf.in (0.29 and 0.23 m.daN )

Subtask 74-11-38-420-050-A ** ON A/C NOT FOR ALL

D. Installation of the Ignition Exciter A-4000JH1 (B-4000JH2).

Ignition Exciter ** ON A/C NOT FOR ALL

(1) Install the ignition exciter (5) and the ignition cooler box (9).
(a) Put the ignition exciter (5) and the ignition cooler box (9) in position on the mounting bracket (2).
(b) Install the bonding strap (7) on the lower forward bolt (6).
(c) Install the bolts (6) and the nuts (1).
(d) TORQUE the bolts (6) to between 45 and 36 lbf.in (0.51 and 0.41 m.daN )

(Ref. AMM TASK 70-23-11-911-013).

Pre SBE 74-0002
SBE 74-0003
(2) Connect the ignition lead (10).
(a) Install the AIPC 74-21-43-80-020 GROMMET (12) on the ignition lead (10).
(b) Connect the ignition lead (10) to the ignition exciter (5).
(c) TORQUE the ignition lead connector to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
End of Pre SBE 74-0002
End of SBE 74-0003

SBE 74-0002
Pre SBE 74-0003
(3) Connect the ignition lead (10).
(a) Install the ignition lead (10).
(b) Connect the ignition lead (10) to the ignition exciter (5).
(c) TORQUE the ignition lead connector to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
End of SBE 74-0002
End of Pre SBE 74-0003

(4) Install the cooling shroud (14).
(a) Put the cooling shroud (14) in position and install the clamps (13) and (15).
(b) TORQUE the clamp screws to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(5) Connect the air inlet hose (4).
(a) Connect the air inlet hose (4) to the ignition cooler box (9) and install the clamp (3).
(b) Tighten the clamp (3) by hand.
(6) Connect the input lead (11) to the ignition exciter (5) (Ref. AMM TASK 70-23-15-912-010).

Subtask 74-11-38-865-051-A ** ON A/C NOT FOR ALL

E. 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 74-11-38-720-050-A ** ON A/C NOT FOR ALL

F. Do an operational test of the ignition system (Ref. AMM TASK 74-00-00-710-041).

5. Close-up
Subtask 74-11-38-410-050-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 right thrust reverser half (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 74-11-38-440-050-A ** ON A/C NOT FOR ALL

B. Activate the thrust reverser HCU (Ref. AMM TASK 78-30-00-440-012).

Subtask 74-11-38-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowls (Ref. AMM TASK 71-13-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 13:08:49 UTC