Inspection of the Ignitor Plug [IAE]

TASK 74-21-41-200-010-A
Inspection of the Ignitor Plug

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

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	WARNING NOTICE(S)
IAE2J13314	1	GAUGE-EROSION MEASURING

B. 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

C. Referenced Information

REFERENCE	DESIGNATION
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 74-21-41-000-010-A	Removal of the Igniter Plug
TASK 74-21-41-400-010-A	Installation of the Igniter Plug
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
Arc Sign on Terminal Button
Discharge Sign on Ceramic Insulator
Erosion Limit of Igniter Plug
Thread and Wear Area

3. Job Set-up
Subtask 74-21-41-941-051-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 74-21-41-010-051-A ** ON A/C NOT FOR ALL

B. Open the fan cowls (Ref. AMM TASK 71-13-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
437AL 438AR.
(2) FOR [1000EM2] (ENGINE-2)
447AL 448AR.

Subtask 74-21-41-040-051-A ** ON A/C NOT FOR ALL

C. Deactivate the thrust reverser Hydraulic Control Unit (HCU) (Ref. AMM TASK 78-30-00-040-012).

Subtask 74-21-41-010-053-A ** ON A/C NOT FOR ALL

D. Open the thrust reverser halves (Ref. AMM TASK 78-32-00-010-010):
(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

4. Procedure
Subtask 74-21-41-020-051-A ** ON A/C NOT FOR ALL

A. Remove the ignitor plug (Ref. AMM TASK 74-21-41-000-010).

Subtask 74-21-41-210-050-A ** ON A/C NOT FOR ALL

B. Visually examine the ignitor plug according to the following acceptance standards:
(1) Visually inspect for cracks in the plug body and the ceramic insulator.

Arc Sign on Terminal Button ** ON A/C NOT FOR ALL

Cracks are not permitted.
(2) Visually inspect the terminal button for arc sign (erosion).

Arc Sign on Terminal Button ** ON A/C NOT FOR ALL

Too much erosion is not permitted.
(3) Visually inspect the ceramic insulator for discharge sign.

Discharge Sign on Ceramic Insulator ** ON A/C NOT FOR ALL

Discharge sign is not permitted.
(4) Inspect the ground electrode for erosion with IAE2J13314 GAUGE-EROSION MEASURING.

Erosion Limit of Igniter Plug ** ON A/C NOT FOR ALL

Erosion that is more than the limit shown is not permitted.
(5) Visually inspect the ignitor plug for localized wear.

Thread and Wear Area ** ON A/C NOT FOR ALL

Wear exceeding 0.03 in. (0.76 mm) depth or wear which breaks through to an internal cooling hole is not permitted.
(6) Visually inspect threads of ignitor plug.

Thread and Wear Area ** ON A/C NOT FOR ALL

Damaged thread are not acceptable.
(7) Detect the internal cracks or breaks by shaking plug and listening for sound. Internal cracks are not permitted.

Subtask 74-21-41-420-051-A ** ON A/C NOT FOR ALL

C. Install the ignitor plug (Ref. AMM TASK 74-21-41-400-010).

5. Close-up
Subtask 74-21-41-410-051-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 halves (Ref. AMM TASK 78-32-00-410-010):
(a) FOR [1000EM1] (ENGINE-1)
451AL 452AR.
(b) FOR [1000EM2] (ENGINE-2)
461AL 462AR.

Subtask 74-21-41-440-051-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 74-21-41-410-053-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) 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.
(3) Remove the WARNING NOTICE(S).

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