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

TASK 36-12-00-615-804-A-02
Decontamination of the Bleed-Air Ducting System Disconnected at Pressure Regulating Valve (PRV) (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 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.

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: 420

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
420	ENG 2 PYLON BOX AND FORWARD FAIRING

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 36-12-00-941-070-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 36-12-00-865-114-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
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
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-00-860-129-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 2 BLEED pushbutton-switch is 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) In the cockpit, 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 36-12-00-480-063-A ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air duct:
(a) Disconnect the bleed air duct from the PRV (4000HA2) of engine 2 (Ref. AMM TASK 36-11-49-000-001) and (Ref. AMM TASK 36-11-49-000-040).
(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 (4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

Subtask 36-12-00-480-063-B ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air duct:
(a) Disconnect the bleed air duct from the PRV (4000HA2) of engine 2 (Ref. AMM TASK 36-11-49-000-010).
(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 (4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

Subtask 36-12-00-480-063-D ** ON A/C NOT FOR ALL

D. Preparation for Cleaning of the Bleed-Air Ducting System
(1) Disconnection of the engine bleed-air duct:
(a) Disconnect the bleed air duct from the PRV (4000HA2) of engine 2 (Ref. AMM TASK 36-11-49-000-042) and (Ref. AMM TASK 36-11-49-000-043).
(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 (4000HA2).
(4) Put the BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

4. Procedure
Subtask 36-12-00-615-062-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 36-12-00-080-063-A ** ON A/C NOT FOR ALL

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 (4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air duct to the PRV (4000HA2) of engine 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 36-12-00-080-063-B ** ON A/C NOT FOR ALL

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 (4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air duct to the PRV (4000HA2) of engine 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 36-12-00-080-063-D ** ON A/C NOT FOR ALL

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 (4000HA2).
(b) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(c) Connect the bleed air duct to the PRV (4000HA2) of engine 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 36-12-00-790-056-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 36-12-00-860-130-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 36-12-00-410-084-A ** ON A/C NOT FOR ALL

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

[Rev.10 from 2021] 2026.04.01 01:14:22 UTC