Installation of the Igniter Plug [PW11]

TASK 74-21-01-400-801-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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.

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 install the igniter plug 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	WRENCH - SOCKET
No specific	1	WRENCH - STANDARD
No specific	Torque wrench: range to between 250 and 225 lbf.in (2.83 and 2.54 m.daN )
No specific	Torque wrench: range to between 350 and 300 lbf.in (3.96 and 3.39 m.daN )
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
PWA24524	1	TAP THREAD CHASING - DIFFUSER CASE IGNITER BOSS

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.P05-291)	safety cable
(Material No.P05-292)	safety cable ferrule

C. 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

D. Referenced Information

REFERENCE	DESIGNATION
TASK 70-24-00-910-813-A	Assembly - PWA 316 - Safety Cable Installation
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 71-13-00-410-802-A	Closing of the Fan Cowl Doors
TASK 72-41-01-920-803-A	Replacement of the Diffuser Case Insert and Spacer
TASK 74-00-00-710-802-A	Operational Test of the Ignition System with the CFDS
TASK 74-21-00-100-801-A	Cleaning of the Ignition Exciter, Ignition Cables and Igniters
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-805-A	Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-802-A	Opening of the Thrust Reverser Cowl-Doors
TASK 78-36-00-410-802-A	Closing of the Thrust Reverser Cowl-Doors
Igniter Plug - Plug A or B

3. Job Set-up
Subtask 74-21-01-941-051-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) Make sure that you did the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).

Subtask 74-21-01-865-051-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: 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 74-21-01-010-052-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the fan cowl doors are open (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) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 74-21-01-040-051-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) Make sure that you did the deactivation of the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 74-21-01-010-053-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Make sure that the right thrust-reverser cowl-door is open (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 74-21-01-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Igniter Plug

CAUTION: REMOVE THE PROTECTION COVERS FROM THE OPENINGS AS NECESSARY TO PREVENT ENGINE DAMAGE.

(1) Remove all the necessary COVER - PROTECTION to prevent damage to the engine.
(2) Find the igniter plug (1) located approximately at the 3 o'clock position on the diffuser case.
(3)

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

NOTE: The igniter plugs are installed into the igniter boss inserts.

(a) If you cannot install the igniter plugs (1) with your hand, you can use the PWA24524 TAP THREAD CHASING - DIFFUSER CASE IGNITER BOSS to clean the threads:
1 Do not remove the inserts. Removal of the inserts requires reclassifying the igniter plug spacers
2 Make sure the diffuser case insert safety cable has been removed before the PWA211825 IGNITER ADAPTER is installed.
3 If the insert is loose:
a TORQUE the insert with the PWA212262 Igniter Insert Adapter to between 470 and 400 lbf.in (5.31 and 4.52 m.daN )

(Ref. AMM TASK 72-41-01-920-803).
4 If the insert is not usable, replace the insert and classified spacer (Ref. AMM TASK 72-41-01-920-803).
(b) Cleaning of the igniter plug (1):
1 For new or refurbished hardware, do not clean the igniter plug.

CAUTION: DO NOT USE A THREAD CHASING DIE ON THE IGNITER PLUG. THE THREADS ARE SILVER PLATED AND HAVE A TIGHT TOLERANCE TO MAKE SURE THE IGNITER PLUG FITS CORRECTLY. DO NOT CLEAN THE IGNITER PLUG THREADS TOO MUCH. IF YOU DO NOT OBEY THIS CAUTION, DAMAGE TO THE IGNITER PLUG CAN OCCUR.

2 Clean the igniter plug (1) (Ref. AMM TASK 74-21-00-100-801).
(4) Install the igniter plug (1) as follows:

CAUTION: DO NOT APPLY ANTI-SEIZE COMPOUND TO THE THREADS OF THE PLUG. ANTI-SEIZE COMPOUND CAN CHANGE THE TORQUE AND CAUSE DAMAGE TO THE INSERT.

(a) Install the igniter plug (1) on the diffuser case insert.
(b) Attach the PWA211825 IGNITER ADAPTER body onto the diffuser case insert and put the WRENCH - STANDARD on the plug (1).
(c) Install a WRENCH - SOCKET to the PWA211825 IGNITER ADAPTER drive attachment.
(d) TORQUE the igniter plug (1) to between 350 and 300 lbf.in (3.96 and 3.39 m.daN )

.
(e) Safety the insert with safety cable (Material No.P05-291) and a safety cable ferrule (Material No.P05-292) (Ref. AMM TASK 70-24-00-910-813).
(5) Connect the ignition cable to the igniter plug (1) as follows:
(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.

CAUTION: DO NOT BEND OR TWIST THE IGNITION CABLES. INSTALL THE CABLE ENDS STRAIGHT INTO THE IGNITER PLUG RECEPTACLES. IF NECESSARY, UNCLIP THE IGNTION 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.

1 Install the cable on the igniter plug (1).

CAUTION: USE A SECOND WRENCH TO HOLD THE MATING PARTS WHEN YOU LOOSEN OR TIGHTEN THE CABLE NUT. IF YOU DO NOT OBEY THIS CAUTION, YOU CAN TWIST THE PARTS OR CAUSE DAMAGE TO THEM.

2 TORQUE the nut to between 250 and 225 lbf.in (2.83 and 2.54 m.daN )

.
3 Engage all of the spring clips to the ignition cable.
4 Do Step 4.A.(3) through Step 4.A.(5)(c)3_ again for the second igniter plug (1).

5. Close-up
Subtask 74-21-01-860-050-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the right thrust-reverser cowl-door (Ref. AMM TASK 78-36-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
452AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
462AR

Subtask 74-21-01-440-050-A ** ON A/C NOT FOR ALL

B. Do the reactivation of the thrust reverser system after maintenance (Ref. AMM TASK 78-30-00-440-805).

Subtask 74-21-01-410-050-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the access platform(s).
(2) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-802):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
437AL, 438AR
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
447AL, 448AR
(3) Remove the WARNING NOTICE(S).

Subtask 74-21-01-865-052-A ** ON A/C NOT FOR ALL

D. Remove the safety clip(s) and tag(s) and close this (these) circuit breaker(s) (circuit breaker(s) with orange extension caps) :

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 74-21-01-720-050-A ** ON A/C NOT FOR ALL

E. Tests
(1) Do the operational test of the ignition system (Ref. AMM TASK 74-00-00-710-802).

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