Installation of the Igniter Plug [IAE]

TASK 74-21-41-400-010-A
Installation of the Igniter Plug

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 CONNECT THE ELECTRICAL CONNECTOR. THE CONDUIT CAN BE DAMAGED AND CAN CAUSE ELECTRICAL CIRCUIT DEFECTS.

FIN: 4001JH1 ** ON A/C NOT FOR ALL
FIN: 4001JH2 ** ON A/C NOT FOR ALL

1. Reason for the Job
There are two igniter plugs on each engine. This task gives the procedure to install one igniter plug. Use the same procedure to install the second igniter plug.
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	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 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 )
No specific	Torque wrench: range to between 360 and 300 lbf.in (4.07 and 3.39 m.daN )
No specific	Torque wrench: range to between 700 and 600 lbf.in (7.91 and 6.78 m.daN )
IAE1P16092	1	GAGE, IGNITER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.V01-124)	Isopropyl Alcohol, Technical grade
(Material No.V02-119)	Lockwire
(Material No.V02-141)	Lockwire
(Material No.V10-109)	anti-seize lubricant
(Material No.V10-129)	anti-seize paste

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

E. 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
Igniter Plug
Clip Points
Checking Ignitor Plug, Immersion Depth

3. Job Set-up
Subtask 74-21-41-860-050-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) pushbutton switch is off. Make sure that a WARNING NOTICE(S) is in position to tell persons not to energize the FADEC 1(2).
(3) Make sure that the ACCESS PLATFORM 1M(3 FT) is in position.

Subtask 74-21-41-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors 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 are open (Ref. AMM TASK 78-32-00-010-010):
(a) FOR [1000EM1] (ENGINE-1)
452AR
(b) FOR [1000EM2] (ENGINE-2)
462AR

Subtask 74-21-41-040-052-A ** ON A/C NOT FOR ALL

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

4. Procedure
Subtask 74-21-41-220-050-A ** ON A/C NOT FOR ALL

A. Check the Igniter Plug Immersion Depth

Checking Ignitor Plug, Immersion Depth ** ON A/C NOT FOR ALL

NOTE: When you change the igniter plug only it is not necessary to do the procedure that follows. The immersion check is only required when maintenance is performed on the insert or when instructed to do so by the Trouble Shooting Manual.

NOTE: For the location of the igniter plugs on the diffuser case see view G-G (two places on Fig. 403/TASK 74-21-41-991-15600-001).

(1) Measure the distance E from the top of the insert to point L on the outer combustion chamber nearest the fuel nozzle. Use the IAE1P16092 GAGE, IGNITER.
(2) Measure the distance D from the surface of the igniter plug that touches the threaded insert to the inner end of the igniter plug.
(3) The difference between distance E and distance D is the ignitor immersion depth F which must be 0.040 to 0.080 in. (1.02 to 2.03 mm).
(4) If you do not get dimension F you will have to do the procedure that follows:
(a) Remove the lockwire that locks the igniter threaded insert to the case.
(b) Remove the igniter threaded insert and classified spacer(s). A maximum of two spacers may be used at each igniter location. Total thickness of the two spacers shall not be more than 0.300 in. (7.62 mm).
(c) After the threaded insert has been removed, inspect the threads in the diffuser case and on the insert for damage and metal pickup. Carefully remove loose or sheared metal on the threads.
(d) If the diffuser case threads are damaged, repair threads using a 1.0625-16UNJ-3B tap. If threads are missing, rounded, sheared, grooved or pitted, engine should be removed from service.
(e) If the threads on the insert are damaged, replace the insert.
(f) Select one or two spacers, not to exceed the 0.300 in. (7.62 mm) thickness limit, to get the correct igniter plug immersion depth F.
(g) Apply anti-seize lubricant (Material No.V10-109) or anti-seize paste (Material No.V10-129) to the igniter threaded insert. Remove all unwanted compound.
(h) Install selected spacer(s) and the igniter threaded insert.
(i) Torque the igniter threaded insert to between 700 and 600 lbf.in (7.91 and 6.78 m.daN )

.
(j) Safety the igniter threaded insert with Lockwire (Material No.V02-119) or Lockwire (Material No.V02-141) .

Subtask 74-21-41-420-050-A ** ON A/C NOT FOR ALL

B. Installation of the Igniter Plug (4001JH1,4001JH2)

Igniter Plug ** ON A/C NOT FOR ALL

(1) Ensure that the electrical terminal is thoroughly cleaned with V01-124Isopropyl Alcohol, Technical grade.
(2) Install the igniter plug.
(a) Make sure that the thread of the igniter plug (7) is clean.
(b) Apply lubricant.

CAUTION: APPLY ANTI-SEIZE COMPOUND MODERATELY TO THE PLUG THREAD. IF TOO MUCH COMPOUND IS APPLIED IT COULD GO IN TO THE ENGINE.

CAUTION: DO NOT APPLY LUBRICANT OR ANY TYPE OF ANTI-SEIZE PRODUCT TO THE THREAD OF THE ELECTRICAL TERMINAL OF THE PLUG. IF YOU DO, THERE IS A RISK THAT THE LUBRICANT WILL GO INTO THE ENGINE.

1 Apply anti-seize paste (Material No.V10-129) to the plug threads.
(c) Install the igniter plug (7). Do not let the ignitor plug threaded insert turn. When you torque the ignitor plug, hold the threaded insert with a wrench.

NOTE: On installation the igniter plug make sure that the plug goes through the outer liner of the combustion chamber.

(d) TORQUE the igniter plug (7) to between 360 and 300 lbf.in (4.07 and 3.39 m.daN )

(Ref. AMM TASK 70-23-11-911-013).
(3) Connect the ignition lead.

Igniter Plug ** ON A/C NOT FOR ALL

(a) Install the AIPC 74-21-41-80-100 GROMMET (3) to the ignition lead (4) and connect the ignition lead (4) to the igniter plug (7) (Ref. AMM TASK 70-23-15-912-010).
(b) 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).
(4) Install the cooling shrouds.

Igniter Plug ** ON A/C NOT FOR ALL

CAUTION: BEFORE YOU REPLACE PRE SBE 70-1005 COOLING SHROUDS WITH POST SBE 70-1005 COOLING SHROUDS OR VICE VERSA, MAKE SURE THAT THE CONCURRENCY REQUIREMENTS IN SBE 70-1005 ARE OBEYED.

(a) Install the cooling shrouds (1) and (5) to the connection between the igniter plug and the ignition lead.
(b) Install the clamps (2) and (6) to the cooling shrouds.
(c) 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) Assemble the clip points.

Clip Points ** ON A/C NOT FOR ALL

(a) Assemble the clip point at Detail E with the bolt (18), the washers (19) and (23), the clips (20) and (22), the spacer (21) and the nut (24).
(b) 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).
(c) Assemble the clip point at Detail C with the bolt (10), the washer (9) and the clip (8).
(d) TORQUE the bolt (10) and the nuts (11) and (24) to between 45 and 36 lbf.in (0.51 and 0.41 m.daN )

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

Subtask 74-21-41-865-051-A ** ON A/C NOT FOR ALL

C. 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 74-21-41-720-050-A ** ON A/C NOT FOR ALL

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

5. Close-up
Subtask 74-21-41-410-052-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 74-21-41-440-050-A ** ON A/C NOT FOR ALL

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

Subtask 74-21-41-410-050-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).
(3) Remove the access platform(s).

[Rev.10 from 2021] 2026.04.01 03:08:07 UTC