W DOC AIRBUS | AMM A320F

Visual Inspection of the Ignition Lead [CFML]

TASK 74-21-05-200-801-A
Visual Inspection of the Ignition Lead

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
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.
ZONE: 400
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)
No specific
Torque wrench: range to between 37 and 32 lbf.in (0.42 and 0.36 m.daN ) T
No specific
Torque wrench: range to between 297 and 253 lbf.in (3.36 and 2.86 m.daN ) T
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.CP1041)
isopropyl alcohol
(Material No.CP2011)
stoddard solvent
(Material No.CP2674)
lint-free cloth
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
400
POWER PLANT, NACELLES AND PYLONS
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL, 438AR, 451AL, 452AR
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL, 448AR, 461AL, 462AR
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 70-70-00-910-804-A
Electrical Standard Practices
TASK 71-13-00-010-803-A
Opening of the Fan Cowl Doors
TASK 71-13-00-410-803-A
Closing of the Fan Cowl Doors
TASK 74-21-05-000-801-A
Removal of the Ignition Lead 2
TASK 74-21-05-000-802-A
Removal of the Ignition Lead 1
TASK 74-21-05-400-801-A
Installation of the Ignition Lead 2
TASK 74-21-05-400-802-A
Installation of the Ignition Lead 1
TASK 78-30-00-040-809-A
Deactivation of the Thrust Reverser System for Ground Maintenance
TASK 78-30-00-440-809-A
Reactivation of the Thrust Reverser System after Ground Maintenance
TASK 78-36-00-010-806-A
Opening of the Thrust Reverser Cowl Doors
TASK 78-36-00-410-806-A
Closing of the Thrust Reverser Cowl Doors
F Illustration of the Ignition Lead Inspection
3. Job Set-up
Subtask 74-21-05-941-050-A
A. Safety Precautions
   (1) On the center pedestal, on ENG panel 115VU:
     (a) Make sure that the ENG/MODE selector switch is in the NORM position.
     (b) Make sure that the ENG/MASTER 1(2) control switch was in the OFF position not less than five minutes before you do this procedure.
     (c) Put WARNING NOTICE(S) in position to tell persons not to operate:
  • The ENG/MODE selector switch, and
  • The ENG/MASTER 1(2) control switch.
   (2) On the ENG section of maintenance panel 50VU:
     (a) Make sure that the ON legend of the FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put a WARNING NOTICE(S) in position to tell persons not to energize FADEC 1(2).
Subtask 74-21-05-865-050-A
B. Open, safety and tag this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
Subtask 74-21-05-010-050-A
C. Get Access
   (1) Open the fan cowl doors (Ref. AMM TASK 71-13-00-010-803):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
Subtask 74-21-05-040-050-A
D. Deactivation of the Thrust Reverser System for Maintenance
WARNING: YOU MUST DEACTIVATE THE THRUST REVERSER BEFORE YOU DO WORK ON OR AROUND IT. IF YOU DO NOT, THE THRUST REVERSER CAN OPERATE ACCIDENTALLY AND CAUSE AN INJURY AND/OR DAMAGE.
   (1) Do the deactivation of the thrust reverser system for maintenance (Ref. AMM TASK 78-30-00-040-809).
Subtask 74-21-05-010-051-A
E. Open the thrust reverser cowl-doors (Ref. AMM TASK 78-36-00-010-806):
   (1) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
   (2) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR.
4. Procedure
Subtask 74-21-05-020-050-A
A. Disconnect the ignition lead 1 or ignition lead 2 connector (Ref. AMM TASK 70-70-00-910-804).
Subtask 74-21-05-110-050-A
B. Clean the ceramic insulator and contact with lint-free cloth (Material No.CP2674) that is moist with stoddard solvent (Material No.CP2011) .
Subtask 74-21-05-210-050-A
C. Inspection of the Ignition Lead
Inspection/Check
Maximum Serviceable Limits
Remarks
1.Broken or missing wire braid
a) The total area of damage must not be more than 0.375 in.2 (241.94 mm2).
b) There is a maximum of one damaged area for every 3 in. (76.20 mm) of lead length.
c) All damaged areas are more than 0.5 in. (12.70 mm) in length from the attaching hardware or the clamps.
d) All damaged braids must be removed.
Replace the ignition lead:
2.Kinks and creases in the ignition lead cables
Not serviceable
Replace the ignition lead:
3.Damage to the ignition lead cable coupling nuts
Not serviceable
Replace the ignition lead:
4.Damage to the ignition lead cable elbow assembly and shell
a) Any number of scratches are allowed if they are less than 0.0015 in. (0.04 mm) in depth.
b) Any number of dents are allowed if they are less than 0.002 in. (0.05 mm) in depth and less than 0.005 in. (0.13 mm) in diameter.
c) There are no cracks or creases.
Replace the ignition lead:
5.Carbon track marks on the terminal ends of the leads
a) Use isopropyl alcohol (Material No.CP1041) and a lint-free cloth (Material No.CP2674) , to remove the carbon track marks.
b) Carbon track marks on the terminal ends of the lead that cannot be removed are not permitted.
Replace the ignition lead:
6.Arcing
Not serviceable
Replace the ignition lead:
7.Cracks
Not serviceable
Replace the ignition lead:
8.Damage on the ignition cooling duct flexible joints
Not serviceable
Replace the ignition lead:
9.Signs of a loose ignition lead cable at the igniter
If the ignition lead cables are loose, do these steps:
a) Loosen the hose clamps and remove the cooling air shroud halves.
b) TORQUE the ignition lead coupling nuts to between 297 and 253 lbf.in (3.36 and 2.86 m.daN ) T.
c) Put the cooling air shroud halves into their positions on the igniter.
d) Move the hose clamps into their positions on the igniters.
e) TORQUE the hose clamps to between 37 and 32 lbf.in (0.42 and 0.36 m.daN ) T.

Subtask 74-21-05-420-050-A
D. Connect the ignition lead connector (Ref. AMM TASK 70-70-00-910-804).
5. Close-up
Subtask 74-21-05-410-050-A
A. 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 78-36-00-410-806):
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
451AL 452AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
461AL 462AR.
Subtask 74-21-05-440-050-A
B. Do the reactivation of the thrust reverser after maintenance (Ref. AMM TASK 78-30-00-440-809).
Subtask 74-21-05-410-051-A
C. Close Access
   (1) Close the fan cowl doors: (Ref. AMM TASK 71-13-00-410-803)
     (a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENGINE 1)
437AL 438AR
     (b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENGINE 2)
447AL 448AR.
   (2) Remove the WARNING NOTICE(S).
Subtask 74-21-05-865-051-A
D. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
PANELDESIGNATIONFINLOCATION
** ON A/C ALL
49VUENGINE/1 AND 2/IGN/SYS A1JHA03
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENGINE 1)
121VUENGINE/IGN/ENG1/SYS B3JH1P41
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENGINE 2)
121VUENGINE/IGN/ENG2/SYS B3JH2P42
[Rev.10 from 2021] 2026.04.01 03:08:53 UTC
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