Decontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (4000HA1,4000HA2) with the APU Bleed Pressure

TASK 36-12-00-615-804-A
Decontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (4000HA1,4000HA2) with the APU Bleed Pressure

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.

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.

THERE IS A RISK OF INJURY IF YOU GO INTO THESE AREAS.

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.

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
ZONE: 420
ZONE: 811

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	BLANKET - HEAT ISOLATION
No specific	AR	COVER - PROTECTION
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
410	ENG 1 PYLON BOX AND FORWARD FAIRING
420	ENG 2 PYLON BOX AND FORWARD FAIRING
811	FORWARD AVIONICS COMPARTMENT DOOR

C. Referenced Information

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 36-11-00-720-005-A	Leak Check of Engine Bleed Air Supply System and Packs Components with APU Bleed Air
TASK 36-11-49-000-001-A	Removal of the Mid Stage Tee Duct
TASK 36-11-49-000-010-B	Removal of the Upper Bleed-Air Duct
TASK 36-11-49-000-040-A	Removal of the Pylon Interface Duct
TASK 36-11-49-000-042-A	Removal of the Pylon Interface Duct
TASK 36-11-49-000-043-A	Removal of the Mid Stage Tee Duct
TASK 36-11-49-400-001-A	Installation of the Mid Stage Tee Duct
TASK 36-11-49-400-010-B	Installation of the Upper Bleed-Air Duct
TASK 36-11-49-400-040-A	Installation of the Pylon Interface Duct
TASK 36-11-49-400-042-A	Installation of the Pylon Interface Duct
TASK 36-11-49-400-043-A	Installation of the Mid Stage Tee Duct
TASK 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
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 49-00-00-910-002-A	Safety Precautions for the Operation of the APU (APS 3200)
TASK 49-00-00-910-003-A	Safety Precautions for the Operation of the APU (131-9(A))
Pressure Regulating Valve ** ON A/C NOT FOR ALL
Bleed-Air Ducting System - Location and Detail
BLEED Page
Pressure Regulating Valve ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 36-12-00-941-064-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(1) 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 TASK 49-00-00-910-002)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-910-003).

Subtask 36-12-00-865-108-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) closed:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 1000EM1 (ENGINE1)
49VU	AIR BLEED/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
FOR FIN: 1000EM2 (ENGINE2)
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-12-00-860-117-A ** ON A/C NOT FOR ALL

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 ENG 2 BLEED pushbutton-switch 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) Make sure that the X BLEED selector-switch is in the AUTO position.
(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.
(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 is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1 and 2.

Subtask 36-12-00-480-057-A ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air ducts:
(a) Disconnect the bleed air ducts from the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-000-001) and (Ref. AMM TASK 36-11-49-000-040).
(2) Point the bleed-air joint ducts away from the engines and the electrical cables or equipment.

NOTE: The open ends of the bleed-air joint ducts can point in a direction that the hot bleed air is released freely to the atmosphere.

(3) Put a COVER - PROTECTION on the open ends of the PRV (4000HA1, 4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

Subtask 36-12-00-480-057-B ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air ducts:
(a) Disconnect the bleed air ducts from the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-000-010).
(2) Point the bleed-air joint ducts away from the engines and the electrical cables or equipment.

NOTE: The open ends of the bleed-air joint ducts can point in a direction that the hot bleed air is released freely to the atmosphere.

(3) Put a COVER - PROTECTION on the open ends of the PRV (4000HA1, 4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

Subtask 36-12-00-480-057-D ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air ducts:
(a) Disconnect the bleed air ducts from the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-000-042) and (Ref. AMM TASK 36-11-49-000-043).
(2) Point the bleed-air joint ducts away from the engines and the electrical cables or equipment.

NOTE: The open ends of the bleed-air joint ducts can point in a direction that the hot bleed air is released freely to the atmosphere.

(3) Put a COVER - PROTECTION on the open ends of the PRV (4000HA1, 4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

4. Procedure
Subtask 36-12-00-615-056-A ** ON A/C NOT FOR ALL

A. Cleaning of the Odor Smell in the Bleed-Air Ducting System
(1) Start the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM TASK 49-00-00-860-005)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-008).

NOTE: For the aircraft with APU 131-9(A):

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.

(2) In the cockpit, on AIR COND panel 30VU:
(a) Set the APU BLEED pushbutton-switch to the pushed position (the ON legend is on).
(b) Set the X BLEED selector-switch to the OPEN position.
(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 OPEN.
(4) Wait for a minimum of 15 minutes
(5) 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.

(6) In the cockpit, on AIR COND panel 30VU:
(a) Set the X BLEED selector-switch to the AUTO position.
(b) Set the APU BLEED pushbutton-switch to the released position (the ON legend is off).
(7) Stop the APU:

For GTCP 36-300 APU (Ref. AMM D/O 49-00-00-86)
For APS 3200 APU (Ref. AMM TASK 49-00-00-860-006)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-009).

5. Close-up
Subtask 36-12-00-080-057-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Connect the engine bleed-air ducts as follows:
(a) Remove the COVER - PROTECTION from the open ends of the PRV (4000HA1, 4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air ducts to the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-400-001) and (Ref. AMM TASK 36-11-49-400-040).
(2) Make sure that the work area is clean and clear of tools and other items.

Subtask 36-12-00-080-057-B ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Connect the engine bleed-air ducts as follows:
(a) Remove the COVER - PROTECTION from the open ends of the PRV (4000HA1, 4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air ducts to the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-400-010).
(2) Make sure that the work area is clean and clear of tools and other items.

Subtask 36-12-00-080-057-D ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Connect the engine bleed-air ducts as follows:
(a) Remove the COVER - PROTECTION from the open ends of the PRV (4000HA1, 4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air ducts to the PRV (4000HA1, 4000HA2) of engines 1 and 2 (Ref. AMM TASK 36-11-49-400-042) and (Ref. AMM TASK 36-11-49-400-043).
(2) Make sure that the work area is clean and clear of tools and other items.

Subtask 36-12-00-790-051-A ** ON A/C NOT FOR ALL

B. Leak Test
(1) Do a leak test of the bleed-air duct system (Ref. AMM TASK 36-11-00-720-005):
(a) Make sure that there are no leaks.

Subtask 36-12-00-860-118-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(3) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).

Subtask 36-12-00-410-078-A ** ON A/C NOT FOR ALL

D. Close Access
(1) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:14:19 UTC