W DOC AIRBUS | AMM A320F

Inspection/Check of the Spark Igniter [CFMI]

TASK 74-21-30-200-001-A
Inspection/Check of the Spark Igniter

WARNING: BEFORE YOU START WORK ON THE IGNITION SYSTEM, MAKE SURE THAT THE IGNITION EXCITERS ARE DE-ENERGIZED FOR A MINIMUM OF FIVE MINUTES. ALSO DO NOT TOUCH THE ELECTRICAL CONTACTS. THE IGNITION SYSTEM VOLTAGE IS VERY HIGH, AND THE IGNITION EXCITERS CAN HAVE AN ELECTRICAL CHARGE EVEN WHEN NOT ENERGIZED. IF YOU DO NOT OBEY THESE PRECAUTIONS, INJURY CAN OCCUR.
FIN: 4001JH1 ** ON A/C NOT FOR ALL
FIN: 4001JH2 ** 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
SAFETY CLIP - CIRCUIT BREAKER
No specific
AR
WARNING NOTICE(S)
 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 71-13-00-010-040-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-040-A
Closing of the Fan Cowl Doors
TASK 72-52-00-290-001-A
Borescope Inspection of the HPT Blades (from the Front and the Rear)
TASK 74-21-30-000-001-A
Removal of the Spark Igniter
TASK 74-21-30-400-001-A
Installation of the Spark Igniter
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
F Inspection of the spark igniter
3. Job Set-up
Subtask 74-21-30-941-050-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 74-21-30-865-050-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
Subtask 74-21-30-010-050-A ** ON A/C NOT FOR ALL
C. Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
   (1) FOR [1000EM1] (ENGINE-1)
437AL 438AR
   (2) FOR [1000EM2] (ENGINE-2)
447AL 448AR
Subtask 74-21-30-040-052-A ** ON A/C NOT FOR ALL
D. Make the thrust reverser unserviceable (Ref. AMM TASK 78-30-00-481-041).
Subtask 74-21-30-010-054-A ** ON A/C NOT FOR ALL
E. Open the thrust reverser doors: (Ref. AMM TASK 78-36-00-010-040)
   (1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
   (2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 74-21-30-020-050-A ** ON A/C NOT FOR ALL
F. Remove the spark igniter (Ref. AMM TASK 74-21-30-000-001)
4. Procedure
Subtask 74-21-30-210-050-A ** ON A/C NOT FOR ALL
A. Do the Inspection of the Spark Igniter:
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Body for :
  • Wear from contact with the combustion chamber.
Any amount, 0.030 in. (0.75 mm) deep. No wear completely through the shell is permitted.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
  • Wear through the body from internal arcing.
No wear through the body is permitted.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
2.Tip for :
  • Distortion.
Not serviceable.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
  • Electrode loose or missing.
Not serviceable.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
  • Tip electrode height in relation to the shell tip.
0.25 in. (6.35 mm) max depth below the tip.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
  • Ceramic material cracked or is missing pieces.
Not serviceable.
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
NOTE: Do a borescope inspection of the high pressure turbine rotor when the pin electrodes have missing pieces (Ref. AMM TASK 72-52-00-290-001).
Subtask 74-21-30-210-051-A ** ON A/C NOT FOR ALL
B. Inspect Spark Igniter.
INSPECT/CHECK
MAXIMUM SERVICEABLE LIMITS
REMARKS
1.Threaded connector end for:


-Ceramic-cracked or missing pieces.
Not serviceable
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
-Dirt/grease in terminal well
Not serviceable
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001).
-Arcing or erosion on button contact
Not serviceable
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001)
-Carbon track on ceramics
Not serviceable
Replace the spark igniter (Ref. AMM TASK 74-21-30-000-001) and (Ref. AMM TASK 74-21-30-400-001)
5. Close-up
Subtask 74-21-30-420-050-A ** ON A/C NOT FOR ALL
A. Install spark igniter (Ref. AMM TASK 74-21-30-400-001)
Subtask 74-21-30-410-050-A ** ON A/C NOT FOR ALL
B. Close Access
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Close the thrust reverser cowl doors: (Ref. AMM TASK 78-36-00-410-040)
     (a) FOR [1000EM1] (ENGINE-1)
451AL 452AR
     (b) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 74-21-30-440-051-A ** ON A/C NOT FOR ALL
C. Make the thrust reverser serviceable (Ref. AMM TASK 78-30-00-081-041)
Subtask 74-21-30-410-053-A ** ON A/C NOT FOR ALL
D. 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).
Subtask 74-21-30-865-051-A ** ON A/C NOT FOR ALL
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C NOT FOR ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 1000EM1 (ENGINE1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
121VUENGINE/IGN/ENG1/SYS A BAT2JH1P39
FOR FIN: 1000EM2 (ENGINE2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
121VUENGINE/IGN/ENG2/SYS A BAT2JH2P40
[Rev.10 from 2021] 2026.04.01 03:07:12 UTC
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