Inspection of the Ignition Lead [IAE]

TASK 74-21-43-200-001-A
Inspection of the Ignition Lead

WARNING: DO NOT TOUCH THE HIGH TENSION LEADS OF THE IGNITOR PLUGS 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT BEND THE ELECTRICAL CABLE CONDUIT TOO MUCH WHEN YOU DISCONNECT THE ELECTRICAL CONNECTOR. THE CONDUIT 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
This task gives the permitted damage for the ignition lead.
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	COVER - PROTECTION
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
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 36 and 32 lbf.in (0.41 and 0.36 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.V01-012)	Cleaning fluid

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	GROMMET	AIPC 74-21-41-80-100
25	GROMMET	AIPC 74-21-43-80-020

E. Referenced Information

REFERENCE	DESIGNATION
TASK 70-23-11-911-013-A	General Torque Tightening Techniques
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
Disconnection of the Ignition Leads
Clip Points
Disconnection of the Ignition Leads
Ignition Lead - Inspection/Check
Ignition Lead - Inspection/Check

3. Job Set-up
Subtask 74-21-43-941-052-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 74-21-43-865-055-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 74-21-43-010-056-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

Subtask 74-21-43-941-053-A ** ON A/C NOT FOR ALL

D. Put the Ground Support Equipment into Position
(1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the ignition system.

Subtask 74-21-43-040-054-A ** ON A/C NOT FOR ALL

E. Deactivate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 74-21-43-010-057-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 74-21-43-020-052-A ** ON A/C NOT FOR ALL

A. Disconnection of the Ignition Lead

Disconnection of the Ignition Leads ** ON A/C NOT FOR ALL

Clip Points ** ON A/C NOT FOR ALL

Disconnection of the Ignition Leads ** ON A/C NOT FOR ALL

(1) Loosen the clamps (2), (6), (26) and (28) and move them away from the cooling shrouds (1), (5) and (27).
(2) Remove the cooling shrouds (1), (5) and (27).
(3) Remove the bolt (10), the washer (9) and the clip (8) from the clip point at detail C.
(4) Remove the bolt (18), the washers (19) and (23), the clips (20) and (22), the spacer (21) and the nut (24) from the clip point at detail E.
(5) Remove the bolt (17), the washers (12) and (16), the clips (13) and (15), the spacer (14) and the nut (11) from the clip point at detail D.
(6) Disconnect the ignition lead (4).
(7) Remove and discard the grommets (3) and (25) from the ignition lead (4).

Subtask 74-21-43-620-050-A ** ON A/C NOT FOR ALL

B. Installation of the Covers
(1) Install the COVER - PROTECTION to ignitor plugs and ignition exciters.

Subtask 74-21-43-210-050-A ** ON A/C NOT FOR ALL

C. Visual Inspection of the Ignition Lead

Ignition Lead - Inspection/Check ** ON A/C NOT FOR ALL

(1) Visually examine the ignition lead according to the following acceptance standard:
(a) Examine the area A for discharge sign or evidence of local burning or embrittlement on sleeve. Discharge sign, burning or embrittlement are not permitted.
(b) Examine the contact for arc sign (erosion). Arc sign is not permitted, repair, refer to VRS1644.
(c) Examine the sleeve for cracks and/or separations. Cracks and /or separations are not permitted.
(d) Examine the outer surface of the ignition lead. Crushed conduit, torn braid wire strands and damage to end fittings are not permitted.
(e) Examine the threads of the ignition lead. Damage to the thread is not permitted.

Subtask 74-21-43-630-050-A ** ON A/C NOT FOR ALL

D. Removal of the Covers
(1) Remove the covers to ignitor plugs and ignition exciters.

Subtask 74-21-43-420-052-A ** ON A/C NOT FOR ALL

E. Connection of the Ignition Lead

Disconnection of the Ignition Leads ** ON A/C NOT FOR ALL

(1) Examine the contact, sleeve and thread for contamination caused by liquid or solid unwanted material. If necessary, clean with Cleaning fluid (Material No.V01-012) .
(2) Install the new AIPC 74-21-41-80-100 GROMMET (3) and AIPC 74-21-43-80-020 GROMMET (25) to the ignition lead (4) and connect the ignition lead (4) to the ignition plug (7) and ignition exciter (29).
(3) TORQUE the ignition lead (4) to between 160 and 140 lbf.in (1.81 and 1.58 m.daN )

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

Subtask 74-21-43-420-053-A ** ON A/C NOT FOR ALL

F. Installation of the Cooling Shrouds

Disconnection of the Ignition Leads ** ON A/C NOT FOR ALL

(1) Install the cooling shrouds (1), (5) and (27) to the connection between the ignitor plug and the ignition lead and ignition exciter.
(2) Install the clamps (2), (6), (26) and (28) to the cooling shrouds.
(3) TORQUE the clamp screws to between 25 and 20 lbf.in (0.28 and 0.23 m.daN )

Subtask 74-21-43-420-054-A ** ON A/C NOT FOR ALL

G. Assembly of the Clip Points

Clip Points ** ON A/C NOT FOR ALL

(1) Assemble the clip points at detail E with the bolt (18), the washers (19) and (23), the clips (20) and (22), the spacer (21) and the nut (24).
(2) Assemble the clip point at detail D with the bolt (17), the washers (12) and (16), the clips (13) and (15), the spacer (14) and the nut (11).
(3) Assemble the clip point at detail C with the bolt (10), the washer (9) and the clip (8).
(4) TORQUE the bolt (10) and the nuts (11) and (24) to between 36 and 32 lbf.in (0.41 and 0.36 m.daN )

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

5. Close-up
Subtask 74-21-43-865-056-A ** ON A/C NOT FOR ALL

A. 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 74-21-43-410-054-A ** ON A/C NOT FOR ALL

B. 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 74-21-43-440-052-A ** ON A/C NOT FOR ALL

C. Activate the thrust reverser hydraulic control unit (HCU) (Ref. AMM TASK 78-30-00-440-012)

Subtask 74-21-43-410-055-A ** ON A/C NOT FOR ALL

D. 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).
(3) Remove the access platform(s).

Subtask 74-21-43-720-052-A ** ON A/C NOT FOR ALL

E. Test of the Ignition System
(1) Do a test of the ignition system (Ref. AMM TASK 74-00-00-710-041).
Malfunction is not permitted.

[Rev.10 from 2021] 2026.04.01 03:08:12 UTC