DOC AIRBUS | AMM A320FReactivation of the APU Leak-Detection Loop
TASK 36-12-00-440-808-A
Reactivation of the APU Leak-Detection Loop
MMEL 36-09-01E
AIR APU BLEED LEAK ALERT
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 36-12-00-861-055-A ** ON A/C NOT FOR ALL Subtask 36-12-00-941-082-A ** ON A/C NOT FOR ALL
Subtask 36-12-00-865-165-A ** ON A/C NOT FOR ALL
Subtask 36-12-00-860-153-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:14:57 UTC
Reactivation of the APU Leak-Detection Loop
WARNING:
MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
1. Reason for the JobMMEL 36-09-01E
AIR APU BLEED LEAK ALERT
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | CAP - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 191 | AIR CONDITIONING COMPT AND FAIRINGS |
| 211 | COCKPIT |
| 191DB |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 24-41-00-861-002-A | Energize the Aircraft Electrical Circuits from the External Power |
| TASK 24-41-00-861-002-A-01 | Energize the Aircraft Electrical Circuits from the APU |
| TASK 24-41-00-861-002-A-02 | Energize the Aircraft Electrical Circuits from Engine 1(2) |
| 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 36-11-00-740-001-A | BITE Test of the BMC 1(2) |
| TASK 36-22-00-790-001-A | Leak Check on all the Bleed Air Ducts and the Packs Components |
| AWM 362201 |
Subtask 36-12-00-861-055-A ** ON A/C NOT FOR ALL Subtask 36-12-00-941-082-A ** ON A/C NOT FOR ALL
B. Safety Precautions
(1) In the cockpit, on AIR COND panel 25VU:
(a) Make sure that the ENG BLEED 1 and 2 pushbutton switches are released (the OFF legends are on).
(b) Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
(c) Make sure that the PACK 1 and 2 pushbutton switches are released (the OFF legends are on).
(d) Make sure that the X BLEED selector switch is set to the OFF position.
(e) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG BLEED 1 and 2 pushbutton switches.
(f) Put the WARNING NOTICE(S) in position to tell persons not to operate the APU BLEED system.
(2) Open access door 191DB on the HP ground connector:
(a) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
4. Procedure(1) In the cockpit, on AIR COND panel 25VU:
(a) Make sure that the ENG BLEED 1 and 2 pushbutton switches are released (the OFF legends are on).
(b) Make sure that the APU BLEED pushbutton switch is released (the ON legend is off).
(c) Make sure that the PACK 1 and 2 pushbutton switches are released (the OFF legends are on).
(d) Make sure that the X BLEED selector switch is set to the OFF position.
(e) Put a WARNING NOTICE(S) in position to tell persons not to operate the ENG BLEED 1 and 2 pushbutton switches.
(f) Put the WARNING NOTICE(S) in position to tell persons not to operate the APU BLEED system.
(2) Open access door 191DB on the HP ground connector:
(a) Put the WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
Subtask 36-12-00-865-165-A ** ON A/C NOT FOR ALL
A. Open, safety and tag this(these) circuit breaker(s):
Subtask 36-12-00-440-056-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR BLEED/X FEED/VALVE/BAT | 2HV | D13 |
| 49VU | AIR BLEED/ENG 1/CTL | 3HA1 | D12 |
| 49VU | AIR BLEED/ENG 1/MONG | 2HA1 | D11 |
| 122VU | AIR BLEED/ENG 2/CTL | 3HA2 | Z23 |
| 122VU | AIR BLEED/ENG 2/MONG | 2HA2 | Z22 |
| 122VU | AIR BLEED/X FEED VALVE/NORM | 1HV | Z20 |
B. Reactivation of the APU Leak-Detection Loops
(1) On lower-right connector-plate 95VU, do the steps that follow:
(a) Remove connector 251VC-A from its location.
(b) Remove the CAP - BLANKING from pins 25 and 26 AWM 362201.
(c) Refer to the identification labels of the disconnected cables.
(d) Connect pins 25 and 26 to connector 251VC-A.
(e) Install connector 251VC-A in its initial position.
Subtask 36-12-00-865-166-A ** ON A/C NOT FOR ALL (1) On lower-right connector-plate 95VU, do the steps that follow:
(a) Remove connector 251VC-A from its location.
(b) Remove the CAP - BLANKING from pins 25 and 26 AWM 362201.
(c) Refer to the identification labels of the disconnected cables.
(d) Connect pins 25 and 26 to connector 251VC-A.
(e) Install connector 251VC-A in its initial position.
C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 36-12-00-740-053-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR BLEED/X FEED/VALVE/BAT | 2HV | D13 |
| 49VU | AIR BLEED/ENG 1/CTL | 3HA1 | D12 |
| 49VU | AIR BLEED/ENG 1/MONG | 2HA1 | D11 |
| 122VU | AIR BLEED/ENG 2/CTL | 3HA2 | Z23 |
| 122VU | AIR BLEED/ENG 2/MONG | 2HA2 | Z22 |
| 122VU | AIR BLEED/X FEED VALVE/NORM | 1HV | Z20 |
D. BITE Test
(1) Do the BITE test of BMC 1(2) (Ref. AMM TASK 36-11-00-740-001):
(a) Make sure that there are no messages related to the APU leak-detection loop.
Subtask 36-12-00-790-078-A ** ON A/C NOT FOR ALL (1) Do the BITE test of BMC 1(2) (Ref. AMM TASK 36-11-00-740-001):
(a) Make sure that there are no messages related to the APU leak-detection loop.
E. Leak Test
(1) Do a leak check of the APU bleed-air duct (Ref. AMM TASK 36-22-00-790-001):
(a) Make sure that there are no leaks.
5. Close-up(1) Do a leak check of the APU bleed-air duct (Ref. AMM TASK 36-22-00-790-001):
(a) Make sure that there are no leaks.
NOTE: A leak on the APU bleed-air ducts is a NO GO condition.
Subtask 36-12-00-860-153-A ** ON A/C NOT FOR ALL
A. Aircraft Maintenance Configuration
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Close access door 191DB.
(4) Put the aircraft back to its initial configuration.
Subtask 36-12-00-862-054-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the WARNING NOTICE(S).
(3) Close access door 191DB.
(4) Put the aircraft back to its initial configuration.