Removal of the Ignition Leads [IAE]

TASK 74-21-43-000-010-B
Removal of the Ignition Leads

WARNING: DO NOT TOUCH THE IGNITION SYSTEM COMPONENTS FOR AT LEAST ONE MINUTE AFTER THE IGNITION POWER SUPPLY IS SWITCHED OFF. 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: 4002JH1 ** ON A/C NOT FOR ALL
FIN: 4002JH2 ** 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	ACCESS PLATFORM 1M(3 FT)
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
Connectors and Clip Points
Ignition Lead
Clip Points

3. Job Set-up
Subtask 74-21-43-941-051-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 74-21-43-865-052-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 74-21-43-010-051-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.

Subtask 74-21-43-040-053-A ** ON A/C NOT FOR ALL

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

Subtask 74-21-43-010-055-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 74-21-43-020-051-A ** ON A/C NOT FOR ALL

A. Removal of the Ignition Leads 4002JH1 (4002JH2)
(1) Disconnect the connectors of the ignition leads
(a) Loosen the clamps (3), (5), (8) and (10) and move them away from the cooling shrouds (4) and (9).
(b) Renove the cooling shrouds (4) and (9).
(c) Disconnect both connectors of each of the ignition leads (1) and (6).
(d) Remove the grommets (2) and (7) from each of the ignition leads (1) and (6). Discard the grommets (2) and (7).
(2) Disassemble the clip points of the ignition leads.
(a) Remove the bolt (14), the washers (15) and (19), the clips (16) and (18), the spacer (17) and the nut (20) from the clip point at detail D.
(b) Remove the bolt (11), the washer (12) and the clip (13) from the clip point at detail E.
(c) Remove the bolt (22), the washer (21) and the clip (23) from the clip point at detail F.
(d) Remove the bolt (26), the washer (25) and the clip (24) from the clip point at detail G.
(e) Remove the bolt (41), the washer (42) and the clip (43) and (44) from the clip point at detail H.
(f) Remove the bolt (29), the washer (28) and the clip (27) from the clip point at detail J.
(g) Remove the bolt (37), the washer (38), the clip (39) and the nut (40) from the clip point at detail K.
(h) Remove the bolt (36), the washers (31) and (35), the clips (32) and (34), the spacer (33) and the nut (30) from th clip point at detail L.
(3) Remove the ignition leads from the engine.
(4) Put applicable protective CAP - BLANKING on the connectors of the ignition exciters, the ignition leads and the ignitor plugs.

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