Installation of the Spark Igniter [CFMI]

TASK 74-21-30-400-001-A
Installation of the Spark Igniter

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

1. Reason for the Job
This task gives the data to install the right spark igniter (system A) or the left spark igniter (system B).
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 40 and 35 lbf.in (0.45 and 0.40 m.daN )
No specific	Torque wrench: range to between 290 and 260 lbf.in (3.28 and 2.94 m.daN )
No specific	Torque wrench: range to between 600 and 540 lbf.in (6.78 and 6.10 m.daN )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.CP2101)	graphite grease
(Material No.CP2162)	liquid wrench
(Material No.CP8001)	lockwire 0.032 in. (0.8 mm) dia.
(Material No.CP8002)	lockwire 0.032 in. (0.8 mm) dia

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
FOR [1000EM1] (ENGINE-1)
437AL, 438AR, 451AL, 452AR
FOR [1000EM2] (ENGINE-2)
447AL, 448AR, 461AL, 462AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
10	SEAL	AIPC 74-21-10-01-110
10	SEAL	AIPC 74-21-20-01-060

E. Referenced Information

REFERENCE	DESIGNATION
TASK 71-13-00-010-040-A	Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A	Closing of the Fan Cowl Doors
TASK 74-00-00-710-040-A-01	Operational Test of the Ignition System without CFDS
TASK 74-00-00-710-040-A	Operational Test of the Ignition System
TASK 74-00-00-710-040-A-01	Operational Test of the Ignition System without CFDS
TASK 78-30-00-081-041-A	Make the Thrust Reverser Serviceable after Maintenance
TASK 78-30-00-481-041-A	Make the Thrust Reverser Unserviceable for Maintenance
TASK 78-36-00-010-040-A	Opening of the Thrust Reverser Doors
TASK 78-36-00-410-040-A	Closing of the Thrust Reverser Doors
Spark Igniter
Ignition Lead Assembly
Removal/Installation of the Igniter Bushing

3. Job Set-up
Subtask 74-21-30-860-050-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).

Subtask 74-21-30-010-052-A ** ON A/C NOT FOR ALL

B. Get Access
(1) Make sure that the fan cowl doors are open (Ref. AMM TASK 71-13-00-010-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Make sure that the thrust reverser doors are open (Ref. AMM TASK 78-36-00-010-040):
(3) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(4) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 74-21-30-040-051-A ** ON A/C NOT FOR ALL

C. Make sure that the thrust reverser is unserviceable (Ref. AMM TASK 78-30-00-481-041).

Subtask 74-21-30-865-053-A ** ON A/C NOT FOR ALL

D. 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: 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

4. Procedure

CAUTION: ALIGN THE COMBUSTION CHAMBER FERRULE WITH THE COMBUSTION CASE BOSS AND THE IGNITER BUSHING BEFORE YOU INSTALL THE SPARK IGNITER. IF NOT, DAMAGE TO THE SPARK IGNITER CAN OCCUR.

Subtask 74-21-30-420-052-A ** ON A/C NOT FOR ALL

A. Remove the protective covers from the igniter bushing and put a plastic drift, 0.375 in. (9.52 mm) maximum diameter, through the igniter bushing, the boss of the combustion case and the combustion chamber ferrule to align them.

Subtask 74-21-30-350-050-A ** ON A/C NOT FOR ALL

B. Loosen the ferrule and align it with the igniter bushing and the combustion case boss.
(1) If the ferrule is not easy to move, apply liquid wrench (Material No.CP2162) .

Subtask 74-21-30-420-051-A ** ON A/C NOT FOR ALL

C. Installation of the spark igniter
(1) If the igniter bushing was removed, install as follows:

Removal/Installation of the Igniter Bushing ** ON A/C NOT FOR ALL

NOTE: The depth of the spark igniter is controlled by the igniter bushing and igniter plug gasket(s). Each gasket is 0.015 in. (0.38 mm) in thickness.

(a) Install the igniter plug gaskets that were removed between the igniter bushing and the combustion case boss.
(b) Temporarily install the igniter bushing in the combustion case boss and tighten with your hand.
(c) Measure the dimension from the top aft side of the igniter bushing to the inner surface of the combustion chamber outer liner. The dimension must be approximately 2.550 in. (64.8 mm).
(d) If the dimension is not approximately 2.550 in. (64.8 mm), remove the igniter bushing and add or remove gaskets as required to get this dimension.
(e) TORQUE the igniter bushing to between 600 and 540 lbf.in (6.78 and 6.10 m.daN )

.
(f) Make sure the dimension from the top aft side of the igniter bushing to the inner surface of the combustion chamber outer liner is between 2.534 in. and 2.550 in. (64.36 mm and 64.8 mm).
(g) If the dimension is out of limits, remove the igniter bushing and do steps (b) thru (f) again.
(h) Safety the igniter bushing with CP8001lockwire 0.032 in. (0.8 mm) dia. or CP8002lockwire 0.032 in. (0.8 mm) dia to the adjacent mounting bolt of the fuel nozzle.
(2) Install the spark igniter.
(a) Apply a small amount of graphite grease (Material No.CP2101) to the spark igniter threads that connect with the igniter bushing in the combustion case boss.
(b) Install the spark igniter into the igniter bushing by hand until it touches the bottom. TORQUE the spark igniter to between 290 and 260 lbf.in (3.28 and 2.94 m.daN )

.
(c) Remove the protective covers from the ignition lead.

PRE SB 74-003

(d) Install the caged spring assembly (20) to the ignition lead. Make sure that the large shoulder end of the caged spring assembly (20) is at the contact end of the ignition lead.
(e) Install the ignition lead.

CAUTION: DO NOT APPLY GREASE OR ANY LUBRICANT TO THE THREADS OF THE CONNECTOR ON THE IGNITION LEAD. GREASE AND LUBRICANTS WILL CAUSE DAMAGE TO THE IGNITION LEAD AND THE SPARK IGNITER.

CAUTION: MAKE SURE THAT YOUR HANDS AND TOOLS ARE CLEAN. DO NOT TOUCH THE IGNITION LEAD OR THE SPARK IGNITER WITH DIRTY OR GREASY HANDS AND TOOLS, DIRT AND GREASE WILL CAUSE DAMAGE TO THE IGNITION LEAD AND THE SPARK IGNITER.

1 Install the new white chamfered silicone AIPC 74-21-10-01-110 SEAL (10) or white chamfered silicone AIPC 74-21-20-01-060 SEAL (10) on the ignition lead.

END OF PRE SB 74-003

POST SB 74-003

(f) Install the ignition lead.

CAUTION: DO NOT APPLY GREASE OR ANY LUBRICANT TO THE THREADS OF THE CONNECTOR ON THE IGNITION LEAD. GREASE AND LUBRICANTS WILL CAUSE DAMAGE TO THE IGNITION LEAD AND THE SPARK IGNITER.

1 Install the new blue symmetrical AIPC 74-21-10-01-110 SEAL (10) or blue symmetrical AIPC 74-21-20-01-060 SEAL (10) on the ignition lead.

END OF SB 74-003

(g) Carefully put the ignition lead end into the spark igniter connector and tighten the ignition lead coupling nut by hand.
1 TORQUE the connector nut to between 290 and 260 lbf.in (3.28 and 2.94 m.daN )

.
(h) Assemble the 2 piece cooling shroud onto the flange of the ignition lead, and secure with the shroud clamp.
1 Install the shroud clamp and TORQUE the shroud clamp to between 40 and 35 lbf.in (0.45 and 0.40 m.daN )

. Make sure there is sufficient clearance between the shroud clamp, the cooling shroud, and the fuel manifold and nozzles.
(i) Install the ignition lead in the hinged clamp nearest to the spark igniter. Turn the attachment bolt one-quarter turn to engage the lock, and continue to tighten until the ignition lead cannot be moved in the clamp.

Subtask 74-21-30-865-054-A ** ON A/C NOT FOR ALL

D. 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 74-21-30-710-050-A ** ON A/C NOT FOR ALL

E. Do an operational test of the ignition system (Ref. AMM TASK 74-00-00-710-040).

NOTE: As an alternative procedure you can do this operational test without the Centralized Fault Display System (CFDS) (Ref. AMM TASK 74-00-00-710-040).

5. Close-up
Subtask 74-21-30-410-052-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 thrust reverser doors (Ref. AMM TASK 78-36-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR

Subtask 74-21-30-440-050-A ** ON A/C NOT FOR ALL

B. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041).

Subtask 74-21-30-410-051-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Close the fan cowl doors (Ref. AMM TASK 71-13-00-410-040):
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 03:07:11 UTC