DOC AIRBUS | AMM A320FDecontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (4000HA1) with the APU Bleed Pressure
TASK 36-12-00-615-805-A-01
Decontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (4000HA1) with the APU Bleed Pressure
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 36-12-00-941-073-A
Subtask 36-12-00-615-065-A
Subtask 36-12-00-080-066-A
[Rev.10 from 2021]
2026.04.01 01:14:44 UTC
Decontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (4000HA1) with the APU Bleed Pressure
WARNING:
WHILE THE APU OPERATES, DO NOT GO INTO THESE AREAS:
- THE AREA BEHIND THE APU EXHAUST DUCT: 25m (82ft.) REARWARD OF THE DUCT, MORE THAN 3m (10ft.) ABOVE THE GROUND, AND THE WIDTH OF THE HORIZONTAL STABILIZER
- THE AREA AROUND THE APU AIR-INTAKE: 2m (7ft) AROUND THE INTAKE
- THE AREA OF THE OIL-COOLER OUTLET.
WARNING:
BE CAREFUL WHEN THE DUCTS ARE DISCONNECTED THE TEMPERATURE OF THE EXHAUST GASES FROM THE OPEN ENDS OF THE DISCONNECTED DUCTS CAN BE AS HIGH AS 270 DEG.C (518 DEG.F). THE HOT GASES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
WARNING:
BE CAREFUL WHEN YOU DO WORK ON THE ENGINE AFTER SHUTDOWN. THE ENGINE CAN STAY HOT FOR A LONG TIME. IF YOU DO NOT OBEY THIS INSTRUCTION, INJURY CAN OCCUR.
WARNING:
MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING:
ALWAYS USE APPLICABLE GLOVES TO TOUCH HOT PARTS. HOT PARTS CAN CAUSE INJURY TO PERSONS.
CAUTION:
MAKE SURE THAT THE AREA AROUND THE APU IS CLEAR BEFORE YOU START THE APU.
TOOLS, EQUIPMENT AND MATERIALS IN THE APU COMPARTMENT AND/OR ON THE ACCESS PLATFORM CAN CAUSE DAMAGE TO THE APU WHEN IT OPERATES.
ZONE: 410
1. Reason for the JobSelf explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | BLANKET - HEAT ISOLATION |
| No specific | AR | COVER - PROTECTION |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 410 | ENG 1 PYLON BOX AND FORWARD FAIRING |
| 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 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
| TASK 36-11-49-000-827-A | Removal of the Environmental Control System (ECS) Ducts from the Engine Case Ports to the Pylon Connections |
| TASK 36-11-49-400-827-A | Installation of the Environmental Control System (ECS) Ducts from the Engine Case Ports to the Pylon Connections |
| TASK 36-22-00-790-803-A | Leak Check on all the Bleed Air Ducts and the Pack Components |
| TASK 49-00-00-860-008-A | APU Start by External Power |
| TASK 49-00-00-860-008-A-01 | APU Start by Batteries |
| TASK 49-00-00-860-009-A | APU Shutdown by External Power (131-9(A)) |
| TASK 49-00-00-860-009-A-01 | APU Shutdown by Batteries (131-9(A)) |
| TASK 49-00-00-910-003-A | Safety Precautions for the Operation of the APU (131-9(A)) |
Bleed-Air Ducting System - Location and DetailSubtask 36-12-00-941-073-A
A. Safety Precautions
(1) Put the aircraft in the APU run-up condition.
(2) Obey the safety precautions for the operation of the APU:
Subtask 36-12-00-865-117-A (1) Put the aircraft in the APU run-up condition.
(2) Obey the safety precautions for the operation of the APU:
- For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-91)
- For APS 3200 APU (Ref. AMM D/O 49-00-00-91)
- For 131-9(A) APU (Ref. AMM TASK 49-00-00-910-003).
B. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 36-12-00-860-135-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C ALL | |||
| 49VU | AIR BLEED/ENG 1/CTL | 2HA1 | D11 |
| 122VU | AIR BLEED/ENG 1/MONG | 3HA1 | Z23 |
| 122VU | AIR BLEED/X FEED VALVE/NORM | 1HV | Z20 |
C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(4) In the cockpit, on AIR COND panel 30VU:
(a) Make sure that the ENG 1 and 2 BLEED 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 PACK FLOW selector-switch is set to LO.
(e) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system on the bleed pushbutton switches.
(5) On ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start engine 1 and 2.
(6) On the HP ground connector (7300HM):
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system on the bleed pushbutton switches.
(7) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1 and 2 pushbutton switch are off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1 and 2.
Subtask 36-12-00-480-066-A (1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(4) In the cockpit, on AIR COND panel 30VU:
(a) Make sure that the ENG 1 and 2 BLEED 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 PACK FLOW selector-switch is set to LO.
(e) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system on the bleed pushbutton switches.
(5) On ENG panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start engine 1 and 2.
(6) On the HP ground connector (7300HM):
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system on the bleed pushbutton switches.
(7) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1 and 2 pushbutton switch are off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1 and 2.
D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air duct:
(2) Point the bleed-air joint duct away from the engine and the electrical cables or equipment .
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.
4. Procedure(1) Disconnection of the engine bleed-air duct:
WARNING:
BE CAREFUL WHEN THE DUCTS ARE DISCONNECTED THE TEMPERATURE OF THE EXHAUST GASES FROM THE OPEN ENDS OF THE DISCONNECTED DUCTS CAN BE AS HIGH AS 270 DEG.C (518 DEG.F). THE HOT GASES CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.
(a) Disconnect the bleed air duct from the PRV (4000HA1) of engine 1 (Ref. AMM TASK 36-11-49-000-827). (2) Point the bleed-air joint duct away from the engine and the electrical cables or equipment .
NOTE: The open end of the bleed-air joint duct can point in a direction that the hot bleed air is released freely to the atmosphere.
(3) Put a COVER - PROTECTION on the open end of the PRV (4000HA1). (4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.
Subtask 36-12-00-615-065-A
A. Cleaning of the Odor Smell in the Bleed-Air Ducting System
(1) Start the APU:
(a) Set the X BLEED selector-switch to the CLOSED position.
(b) Set the APU BLEED pushbutton-switch to the pushed position (the ON legend is on).
(3) On the ECAM control panel, push the BLEED key:
(a) On the SD, the BLEED page comes into view.
(b) The BLEED page shows that the X BLEED valve is CLOSED.
(c) The BLEED page shows that the APU bleed air-supply is correct.
(4) On the ECAM display, make sure that the engine bleed temperature is 200 -10 DEG.C or +10 DEG.C (392 -18 DEG.F or +18 DEG.F).
(5) Wait for a minimum of 15 minutes.
(6) The ECAM control panel can show the unusual BLEED and the pack fault messages.
(a) Set the APU BLEED pushbutton-switch to the released position (the ON legend is off).
(b) Set the X BLEED selector-switch to the AUTO position.
(8) Stop the APU:
5. Close-up(1) Start the APU:
- For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
- For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
- For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-008).
NOTE: For the aircraft with APU 131-9(A):
(2) In the cockpit, on AIR COND panel 30VU: - After the APU starts, Airbus recommends you to wait for a minimum of 3 minutes of warm up period before you select the APU BLEED.
(a) Set the X BLEED selector-switch to the CLOSED position.
(b) Set the APU BLEED pushbutton-switch to the pushed position (the ON legend is on).
(3) On the ECAM control panel, push the BLEED key:
(a) On the SD, the BLEED page comes into view.
(b) The BLEED page shows that the X BLEED valve is CLOSED.
(c) The BLEED page shows that the APU bleed air-supply is correct.
(4) On the ECAM display, make sure that the engine bleed temperature is 200 -10 DEG.C or +10 DEG.C (392 -18 DEG.F or +18 DEG.F).
(5) Wait for a minimum of 15 minutes.
(6) The ECAM control panel can show the unusual BLEED and the pack fault messages.
NOTE: The system operates correctly and it is not necessary to do the related troubleshooting procedure at this step.
(7) In the cockpit, on AIR COND panel 30VU: (a) Set the APU BLEED pushbutton-switch to the released position (the ON legend is off).
(b) Set the X BLEED selector-switch to the AUTO position.
(8) Stop the APU:
- For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
- For APS 3200 APU (Ref. AMM D/O 49-00-00-86)
- For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).
Subtask 36-12-00-080-066-A
A. Put the aircraft back to its initial configuration.
(1) Connect the engine bleed-air duct as follows:
(a) Remove the COVER - PROTECTION from the open end of the PRV (4000HA1).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air duct to the PRV (4000HA1) of engine 1 (Ref. AMM TASK 36-11-49-400-827).
(2) Make sure that the work area is clean and clear of tools and other items.
Subtask 36-12-00-790-059-A (1) Connect the engine bleed-air duct as follows:
(a) Remove the COVER - PROTECTION from the open end of the PRV (4000HA1).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air duct to the PRV (4000HA1) of engine 1 (Ref. AMM TASK 36-11-49-400-827).
(2) Make sure that the work area is clean and clear of tools and other items.
B. Leak Test
(1) Do a leak test of the bleed-air duct system (Ref. AMM TASK 36-22-00-790-803):
(a) Make sure that there are no leaks.
Subtask 36-12-00-860-136-A (1) Do a leak test of the bleed-air duct system (Ref. AMM TASK 36-22-00-790-803):
(a) Make sure that there are no leaks.
C. Aircraft Maintenance Configuration
(1) Remove the WARNING NOTICE(S).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(1) Remove the WARNING NOTICE(S).
(2) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(3) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(4) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).