DOC AIRBUS | AMM A320FRemoval of the Left Ignition Lead [CFMB]
TASK 74-21-20-000-002-A
Removal of the Left Ignition Lead
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 74-21-20-941-052-A ** ON A/C NOT FOR ALL
Subtask 74-21-20-020-054-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 13:05:19 UTC
Removal of the Left Ignition Lead
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.
CAUTION:
BE CAREFUL WITH THE IGNITION LEAD TO PREVENT DAMAGE TO THE CONDUIT AND THE INTERNAL WIRES.
1. Reason for the JobSelf explanatory
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 | CAP - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| FOR [1000EM1] (ENGINE-1) | |
| 437AL, 438AR, 451AL, 452AR | |
| FOR [1000EM2] (ENGINE-2) | |
| 447AL, 448AR, 461AL, 462AR | |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 71-13-00-010-040-B | Opening of the Fan Cowl Doors |
| TASK 78-30-00-481-041-B | Make the Thrust Reverser Unserviceable for Maintenance |
| TASK 78-36-00-010-040-B | Opening of the Thrust Reverser Doors |
Left Ignition LeadSubtask 74-21-20-941-052-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 74-21-20-865-055-A ** ON A/C NOT FOR ALL (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).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 74-21-20-010-055-A ** ON A/C NOT FOR ALL | 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 |
C. Get Access
(1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
Subtask 74-21-20-040-054-A ** ON A/C NOT FOR ALL Subtask 74-21-20-010-058-A ** ON A/C NOT FOR ALL (1) Open the fan cowl doors: (Ref. AMM TASK 71-13-00-010-040)
(a) FOR [1000EM1] (ENGINE-1)
437AL 438AR
(b) FOR [1000EM2] (ENGINE-2)
447AL 448AR
(2) Put the ACCESS PLATFORM 1M(3 FT) in position.
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
4. Procedure(1) FOR [1000EM1] (ENGINE-1)
451AL 452AR
(2) FOR [1000EM2] (ENGINE-2)
461AL 462AR
Subtask 74-21-20-020-054-A ** ON A/C NOT FOR ALL
A. Removal of the ignition lead
(1) Disconnect the ignition lead from the aft side of the lower ignition exciter on the fan inlet case.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the ignition lead from the clamps on the core engine.
(4) Remove the shroud clamp and the cooling shroud from the igniter end of the ignition lead.
(5) Loosen the coupling nut and remove the ignition lead
PRE SB 74-002
(6) Remove and discard the white chamfered silicone seal (10).
POST SB 74-002
(7) Remove and discard the blue symmetrical silicone seal (10).
END of SB 74-002
(8) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(9) Remove the ignition lead from the clips which attach the ignition lead to the fan frame, the TGB and the bundle junction box.
(10) Remove the bolt and retaining plate which attach the ignition lead to the bundle junction box cover.
(11) Remove the strut fairings, from both sides of the tube bundle (6 o'clock position) for access to the clamps.
(12) Remove the ignition lead from the clips at the 6 o'clock strut.
(13) Remove the ignition lead
(14) Remove and discard the two O-rings (20) from the lead.
(1) Disconnect the ignition lead from the aft side of the lower ignition exciter on the fan inlet case.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Remove the ignition lead from the clamps on the core engine.
(4) Remove the shroud clamp and the cooling shroud from the igniter end of the ignition lead.
(5) Loosen the coupling nut and remove the ignition lead
CAUTION:
BE VERY CAREFUL WHEN YOU LOOSEN THE COUPLING NUT OF THE IGNITION LEAD. IF NOT YOU CAN DAMAGE THE ADJACENT TUBING.
CAUTION:
MAKE SURE THAT THE FIRST HINGE-TYPE CLAMP IS RELEASED BEFORE YOU REMOVE THE IGNITION LEAD FROM THE SPARK IGNITER. THIS WILL PREVENT DAMAGE TO THE CERAMIC TIP ON THE IGNITER END OF THE IGNITION LEAD.
(a) Loosen the coupling nut and remove the ignition lead from the spark igniter. Pull the ignition lead straight out (no side loading) until free from the igniter. PRE SB 74-002
(6) Remove and discard the white chamfered silicone seal (10).
POST SB 74-002
(7) Remove and discard the blue symmetrical silicone seal (10).
END of SB 74-002
(8) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(9) Remove the ignition lead from the clips which attach the ignition lead to the fan frame, the TGB and the bundle junction box.
(10) Remove the bolt and retaining plate which attach the ignition lead to the bundle junction box cover.
(11) Remove the strut fairings, from both sides of the tube bundle (6 o'clock position) for access to the clamps.
(12) Remove the ignition lead from the clips at the 6 o'clock strut.
(13) Remove the ignition lead
CAUTION:
BE CAREFUL WHEN YOU REMOVE THE IGNITION LEAD FROM THE STRUT BECAUSE THE IGNITION LEAD COULD BECOME DAMAGED.
(a) Carefully pull the ignition lead aft at the 6 o'clock strut. Continue to move the ignition lead aft until it is through the 6 o'clock strut. (14) Remove and discard the two O-rings (20) from the lead.