DOC AIRBUS | AMM A320FPurging of the APU Fuel System
TASK 49-00-00-870-002-A
Purging of the APU Fuel System
1. Reason for the Job
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 49-00-00-941-059-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-870-051-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-420-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:25:49 UTC
Purging of the APU Fuel System
1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE |
| No specific | AR | CAP - BLANKING |
| No specific | AR | CONTAINER 10 L(2 1/2 USGAL) |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 315AL, 316AR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-862-002-A | De-energize the Aircraft Electrical Circuits Supplied from the External Power |
| TASK 24-41-00-862-002-A-01 | De-energize the Aircraft Electrical Circuits Supplied from the APU |
| TASK 24-41-00-862-002-A-02 | De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2) |
| TASK 28-00-00-910-001-A | Fuel Safety Procedures |
| TASK 29-00-00-864-001-A | Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action |
| 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 |
Subtask 49-00-00-941-059-A ** ON A/C NOT FOR ALL
A. Safety Precautions
(1) Obey the Fuel Safety Procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that ground fire extinguishing equipment is available.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
Subtask 49-00-00-865-078-A ** ON A/C NOT FOR ALL (1) Obey the Fuel Safety Procedures (Ref. AMM TASK 28-00-00-910-001).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that ground fire extinguishing equipment is available.
(5) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 49-00-00-010-058-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control switch 11LJ to the on position.
Subtask 49-00-00-020-050-A ** ON A/C NOT FOR ALL (1) Put the ACCESS PLATFORM 3M (10 FT)- ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control switch 11LJ to the on position.
D. Prepare the APU for Purge.
(1) Disconnect the electrical connector P10 from the ignition unit.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Put the CONTAINER 10 L(2 1/2 USGAL) below the primary fuel manifold.
(4) Disconnect the primary fuel-feed pipe at the primary fuel manifold.
(5) Make sure that the APU intake and exhaust blanking plugs are removed.
Subtask 49-00-00-865-079-A ** ON A/C NOT FOR ALL (1) Disconnect the electrical connector P10 from the ignition unit.
(2) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(3) Put the CONTAINER 10 L(2 1/2 USGAL) below the primary fuel manifold.
(4) Disconnect the primary fuel-feed pipe at the primary fuel manifold.
(5) Make sure that the APU intake and exhaust blanking plugs are removed.
E. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
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 49-00-00-870-051-A ** ON A/C NOT FOR ALL
A. Fuel System Purge
(1) On the panel 25VU, push the APU MASTER SW to the ON position.
(2) On the panel 25VU, push the APU START switch to the ON position.
(4) Cancel the motoring cycle when the fuel flow from the disconnected fuel pipe is free of air and/or oil.
(5) On the panel 25VU, push the APU MASTER SW to the OFF position.
Subtask 49-00-00-865-080-A ** ON A/C NOT FOR ALL (1) On the panel 25VU, push the APU MASTER SW to the ON position.
(2) On the panel 25VU, push the APU START switch to the ON position.
NOTE: To cancel the motoring cycle, push the APU MASTER SW to the OFF position.
(3) The starter motor de-energizes after approximately 30 seconds. (4) Cancel the motoring cycle when the fuel flow from the disconnected fuel pipe is free of air and/or oil.
(5) On the panel 25VU, push the APU MASTER SW to the OFF position.
B. Open, safety and tag this(these) circuit breaker(s):
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 49-00-00-420-050-A ** ON A/C NOT FOR ALL
A. Ignition Unit and Fuel System Reactivation
(1) Connect the primary fuel-feed pipe at the primary fuel manifold.
(2) Remove the waste fuel container.
(3) Remove the blanking cap from the ignition unit.
(4) Connect the electrical connector P10 to the ignition unit.
(5) Make sure that the work area is clean and clear of tools and other items.
Subtask 49-00-00-410-062-A ** ON A/C NOT FOR ALL (1) Connect the primary fuel-feed pipe at the primary fuel manifold.
(2) Remove the waste fuel container.
(3) Remove the blanking cap from the ignition unit.
(4) Connect the electrical connector P10 to the ignition unit.
(5) Make sure that the work area is clean and clear of tools and other items.
B. Close Access
(1) Set the LIGHT control switch 11LJ to the off position.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
Subtask 49-00-00-865-081-A ** ON A/C NOT FOR ALL (1) Set the LIGHT control switch 11LJ to the off position.
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the WARNING NOTICE(S).
(5) Remove the access platform(s).
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 49-00-00-860-077-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
D. Aircraft Maintenance Configuration
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).