DOC AIRBUS | AMM A320FInstallation of the Ignition Unit (131-9(A))
TASK 49-41-38-400-003-A
Installation of the Ignition Unit (131-9(A))
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 49-41-38-860-056-A ** ON A/C NOT FOR ALL
Subtask 49-41-38-420-054-A ** ON A/C NOT FOR ALL
Subtask 49-41-38-410-053-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:30:08 UTC
Installation of the Ignition Unit (131-9(A))
WARNING:
DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).
WARNING:
BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 315AL, 316AR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 20-28-00-912-802-A | Electrical Bonding - General Maintenance Procedure |
| TASK 24-42-00-861-001-A | Energize the Ground Service Network from the External Power |
| TASK 24-42-00-862-001-A | De-energize the Ground Service Network Supplied from the External Power |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| TASK 49-00-00-710-009-A | Self-Test of the ECB |
| TASK 52-41-00-010-001-A | Open the APU Doors for Access |
| TASK 52-41-00-410-001-A | Close the APU Doors after Access |
Ignition UnitSubtask 49-41-38-860-056-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below the APU compartment.
(3) Make sure that APU access doors 315AL and 316AR are open (Ref. AMM TASK 52-41-00-010-001).
(4) Make sure that a WARNING NOTICE(S) is in position in the cockpit to tell persons not to set the APU MASTER SW pushbutton to the ON position.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
Subtask 49-41-38-865-062-A ** ON A/C NOT FOR ALL (1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE is in position below the APU compartment.
(3) Make sure that APU access doors 315AL and 316AR are open (Ref. AMM TASK 52-41-00-010-001).
(4) Make sure that a WARNING NOTICE(S) is in position in the cockpit to tell persons not to set the APU MASTER SW pushbutton to the ON position.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
Subtask 49-41-38-420-054-A ** ON A/C NOT FOR ALL
A. Installation of the Ignition Unit
(1) Put the ignition unit (3) in position on the APU.
(2) Install the bonding strap (8) and the bolt (7) (Ref. AMM TASK 20-28-00-912-802).
(3) Install the bonding strap (9) and the bolt (6) (Ref. AMM TASK 20-28-00-912-802).
(4) Install the two washers (4) and the two bolts (5).
(5) TORQUE the bolts (5), (6) and (7) to between 0.627 and 0.513 m.daN (55.49 and 45.40 lbf.in )
.
(6) Remove the blanking caps from the electrical connectors.
(7) Connect the ignition lead (2) and the low-tension electrical lead (1) to the ignition unit (3).
(8) TORQUE the ignition lead (2) to between 2.66 and 2.42 m.daN (19.62 and 17.85 lbf.ft ).
Subtask 49-41-38-865-063-A ** ON A/C NOT FOR ALL (1) Put the ignition unit (3) in position on the APU.
(2) Install the bonding strap (8) and the bolt (7) (Ref. AMM TASK 20-28-00-912-802).
(3) Install the bonding strap (9) and the bolt (6) (Ref. AMM TASK 20-28-00-912-802).
(4) Install the two washers (4) and the two bolts (5).
(5) TORQUE the bolts (5), (6) and (7) to between 0.627 and 0.513 m.daN (55.49 and 45.40 lbf.in )
. (6) Remove the blanking caps from the electrical connectors.
(7) Connect the ignition lead (2) and the low-tension electrical lead (1) to the ignition unit (3).
(8) TORQUE the ignition lead (2) to between 2.66 and 2.42 m.daN (19.62 and 17.85 lbf.ft )
. B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 49-41-38-710-052-A ** ON A/C NOT FOR ALL 5. Close-up| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
Subtask 49-41-38-410-053-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) Set LIGHT switch control 11LJ to the OFF position.
(3) Close APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).
Subtask 49-41-38-860-057-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Set LIGHT switch control 11LJ to the OFF position.
(3) Close APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).
B. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).