Removal of the Igniter Plug [PW11]

TASK 74-21-01-000-801-A
Removal of the Igniter Plug

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.

WARNING: BEFORE YOU REMOVE/INSTALL IGNITION COMPONENTS:

WAIT FOR SOME MINUTES AFTER THE IGNITION SYSTEM IS USED
MAKE SURE THAT THE ENG/MODE SELECTOR SWITCH IS IN THE NORM POSITION.

AFTER YOU REMOVE THE IGNITER LEAD FROM THE IGNITER PLUG, IMMEDIATELY PUT THE IGNITION LEAD TERMINAL IN CONTACT WITH A GOOD GROUND TO LET ALL OF THE ELECTRICAL ENERGY OUT OF THE SYSTEM. THE IGNITION SYSTEM VOLTAGE IS VERY HIGH. IF YOU DO NOT OBEY THESE INSTRUCTIONS, INJURY OR DEATH CAN OCCUR.

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

ZONE: 210
ZONE: 400
FIN: 4036JH ** ON A/C NOT FOR ALL
FIN: 4037JH ** ON A/C NOT FOR ALL

1. Reason for the Job
Use this procedure to remove the igniter plug (A or B) after the ignition system is de-energized.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 1M(3 FT)
No specific	1	COVER - PROTECTION
No specific	1	WRENCH - SOCKET
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 470 and 400 lbf.in (5.31 and 4.52 m.daN )
PWA211825	1	IGNITER ADAPTER
PWA212262	1	Igniter Insert Adapter

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
210	CKPT,FWD COMPT BHD TO FLT COMPT BULKHEAD
400	POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR, 462AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 71-13-00-010-802-A	Opening of the Fan Cowl Doors
TASK 72-41-01-920-803-A	Replacement of the Diffuser Case Insert and Spacer
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
Igniter Plug - Plug A or B

3. Job Set-up
Subtask 74-21-01-941-050-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 74-21-01-865-050-A ** ON A/C NOT FOR ALL

B. Open, safety and tag these circuit breakers in this sequence:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	ENGINE/1 AND 2/IGN/SYS A	1JH	A03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
121VU	ENGINE/IGN/ENG1/SYS B	3JH1	P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
121VU	ENGINE/IGN/ENG2/SYS B	3JH2	P42

Subtask 74-21-01-010-050-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(2) Put an ACCESS PLATFORM 1M(3 FT) in position.

Subtask 74-21-01-040-050-A ** ON A/C NOT FOR ALL

D. Deactivation of the Thrust Reverser for Ground Maintenance

WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.

(1) Do the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 74-21-01-010-051-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Open the right thrust reverser cowl-door (Ref. AMM TASK 78-36-00-010-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

4. Procedure

CAUTION: WIPE CLEAN ALL PARTS AND TOOLS AS NECESSARY TO REMOVE UNWANTED DEBRIS AND PREVENT DAMAGE TO THE ENGINE.

Subtask 74-21-01-020-050-A ** ON A/C NOT FOR ALL

A. Removal of the Igniter Plug
(1)

Igniter Plug - Plug A or B ** ON A/C NOT FOR ALL

CAUTION: DO NOT BEND OR TWIST THE IGNITION CABLES. REMOVE THE CABLE ENDS STRAIGHT FROM THE IGNITER PLUG RECEPTACLES. IF NECESSARY, UNCLIP THE IGNITION CABLE FROM THE SPRING CLIPS TO REMOVE TENSION FROM THE CABLE. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN CAUSE DAMAGE TO THE CABLE ENDS AND/OR IGNITER PLUG CERAMIC.

(2)

Igniter Plug - Plug A or B ** ON A/C NOT FOR ALL

(a) Look to see, if SB C-74-00-0001A has been incorporated before you perform the maintenance steps below.

NOTE: This Service Bulletin changes the igniter to exciter plug cable routing at the igniter plug end so that the igniter plug (upper) will be connected to ignition system B and the igniter plug (lower) will be connected to ignition system A.

(b) If the Service Bulletin is used, the cables should be routed per the Service Bulletin.

NOTE: The figures in this procedure show the pre Service Bulletin configuration.

(c) Loosen the ignition cable nut from the igniter plug (1).
(d) Disengage the cable from the igniter plug (1).
(3) Remove the igniter plug (1) from the diffuser case insert as follows:

CAUTION: HOLD THE INSERT WITH THE ADAPTER WHEN YOU REMOVE THE IGNITER PLUG. IF YOU DO NOT HOLD THE IGNITER BOSS INSERT WHEN YOU REMOVE THE IGNITER PLUG, THERE IS A RISK OF TORQUE LOSS ON THE INSERT AND ENGINE DAMAGE.

(a) Do not remove the inserts, if the inserts are removed the igniter plug spacer thickness will need to be calculated again.
(b) Make sure the diffuser case insert safety cable has been removed before the PWA211825 IGNITER ADAPTER is installed.
(c) Attach the PWA211825 IGNITER ADAPTER body onto the diffuser case insert and put the WRENCH - STANDARD on the plug (1).
(d) While you hold the PWA211825 IGNITER ADAPTER with a WRENCH - STANDARD, install a WRENCH - SOCKET on the PWA211825 IGNITER ADAPTER drive attachment and remove the igniter plug (1).
(e) TORQUE the insert with the PWA212262 Igniter Insert Adapter to between 470 and 400 lbf.in (5.31 and 4.52 m.daN )

if necessary (Ref. AMM TASK 72-41-01-920-803).
(f) Replace the insert and classified spacer if necessary (Ref. AMM TASK 72-41-01-920-803).
(4) Do Step 4.A.(2) and Step 4.A.(3) again to remove the second igniter plug (1).
(5) Installation of protection covers:

CAUTION: INSTALL PROTECTION COVERS ON ALL THE OPENINGS IMMEDIATELY TO PREVENT DAMAGE TO THE ENGINE.

(a) Install COVER - PROTECTION as necessary to prevent damage to the engine.

[Rev.10 from 2021] 2026.04.01 13:03:14 UTC