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

TASK 36-12-00-615-806-A
Decontamination of the Bleed-Air Ducting System disconnected at the Pressure Regulating Valve (PRV) (4000HA1, 4000HA2) 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.

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.

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
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	PLUG - BLANKING
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

C. Referenced Information

REFERENCE	DESIGNATION
TASK 05-24-50-210-801-A	General Visual Inspection of Core Compartment (EWIS)
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 26-12-17-000-803-A	Removal of the Aft Fire/Overheat Detector
TASK 26-12-17-400-803-A	Installation of the Aft Fire/Overheat Detector
TASK 26-12-61-000-802-A	Removal of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables
TASK 26-12-61-400-802-A	Installation of the Loop-A Fire Electrical Harness and the Loop-A Fire Detector Cables
TASK 31-60-00-860-001-A	EIS Start Procedure
TASK 31-60-00-860-002-A	EIS Stop Procedure
TASK 36-11-00-710-802-A	Operational Test of the Bleed Air System
TASK 36-11-49-000-822-A	Removal of the Environmental Control System (ECS) Ducts
TASK 36-11-49-000-823-A	Removal of the Environmental Control System (ECS) Sense Lines
TASK 36-11-49-400-822-A	Installation of the Environmental Control System (ECS) Ducts
TASK 36-11-49-400-823-A	Installation of the Environmental Control System (ECS) Sense Lines
TASK 36-11-49-400-824-A	Installation of the Environmental Control System (ECS) Interface Duct
TASK 36-11-52-000-802-A	Removal of the Bleed Pressure-Regulator Valve
TASK 36-11-52-400-802-A	Installation of the Bleed Pressure-Regulator Valve
TASK 36-11-53-000-802-A	Removal of the Overpressure Valve
TASK 36-11-53-400-802-A	Installation of the Overpressure Valve
TASK 36-22-00-790-802-A	Leak Check on all the Bleed Air Ducts and the Packs 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))
TASK 75-24-49-000-803-A	Removal of the Component Cooling Lines
TASK 75-24-49-400-803-A	Installation of the Component Cooling Lines
TASK 78-32-00-210-821-A	General Visual Inspection (GVI) of the Thrust Reverser Thermal Insulation Blankets
Bleed-Air Ducting System - Location and Detail
BLEED Page
Pressure Regulating Valve

3. Job Set-up
Subtask 36-12-00-941-065-A ** ON A/C NOT FOR ALL

A. Safety Precautions
(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).

Subtask 36-12-00-865-109-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	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
FOR FIN: 1000EM2 (ENGINE2)
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-12-00-860-119-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits from external power (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) 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 the 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 the WARNING NOTICE(S) in position to tell persons not to start engines 1 and 2.
(6) On the HP ground connector (7300HM):
(a) Put the 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 switches are off.
(b) Put the WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1 and 2.

Subtask 36-12-00-020-070-A ** ON A/C NOT FOR ALL

D. Disconnection of the Environmental Control System (ECS) Interface Duct
(1) Remove the overpressure valve (Ref. AMM TASK 36-11-53-000-802):
(a) Put a COVER - PROTECTION on the open end of the overpressure valve.
(2) Remove the ECS starter duct (Ref. AMM TASK 36-11-49-000-822):
(a) Put a PLUG - BLANKING on the open ends of the ECS starter duct.
(3) Make sure that the link assemblies of the ECS interface duct are installed correctly (Ref. AMM TASK 36-11-49-400-824).
(a) Make sure that the link assemblies are not preloaded and do not move because of the engine vibration.

(4) Remove the PRV (4000HA1, 4000HA2) (Ref. AMM TASK 36-11-52-000-802):
(a) Put the COVER - PROTECTION on the open ends of the PRV (4000HA1, 4000HA2).
(5) Remove the Active Clearance Control (ACC) hose (Ref. AMM TASK 75-24-49-000-803):
(a) Put the PLUG - BLANKING on the open ends of the ACC hose.
(6) Remove the ECS sense lines connected to the pylon (Ref. AMM TASK 36-11-49-000-823):
(a) Put the PLUG - BLANKING on the open ends of the ECS sense lines.
(7) Remove the aft fire/overheat detector (Ref. AMM TASK 26-12-17-000-803).
(8) Remove the loop-A fire harness and electrical rail assembly (Ref. AMM TASK 26-12-61-000-802).
(9) If installed, remove the PLUG - BLANKING from the open end of the ECS interface duct.
(10) Put a BLANKET - HEAT ISOLATION on the adjacent electrical cables and components.

4. Procedure
Subtask 36-12-00-615-057-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 D/O 49-00-00-86)
For 131-9(A) APU (Ref. AMM TASK 49-00-00-860-008).

NOTE: After the APU starts, Airbus recommends you to wait for a minimum of 3 minutes for the warm-up period, before you select the APU BLEED.

(2) In the cockpit, on AIR COND panel 30VU:
(a) Set the APU 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.
(c) The BLEED page shows that the APU bleed air supply is correct.
(4) On the ECAM display, make sure that the APU bleed temperature is 200 +10 DEG.C or +10 DEG.C (392 +18 DEG.F or +18 DEG.F).

NOTE: If necessary, increase the APU bleed exhaust to control the temperature.

(5) Wait for a minimum of 15 minutes.
(6) The ECAM control panel can show unusual BLEED and 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 X BLEED selector-switch to the AUTO position.
(b) Set the APU BLEED pushbutton switch to the released position (the ON legend is off).
(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).

5. Close-up
Subtask 36-12-00-210-052-A ** ON A/C NOT FOR ALL

A. General Visual Inspection (GVI)
(1) Do a GVI of the core compartment (Ref. AMM TASK 05-24-50-210-801):
(a) Specially, examine the area/components near the exhaust plumes of the ECS interface duct.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

(b) If you see contamination, use the manufacturer's instructions to clean them.
(2) Do a GVI of the thrust reverser thermal-blanket (Ref. AMM TASK 78-32-00-210-821):
(a) Specially, examine the thermal blankets near the exhaust plumes of the ECS interface ducts.

Subtask 36-12-00-420-057-A ** ON A/C NOT FOR ALL

B. Connection of the ECS Interface Duct
(1) Remove the BLANKET - HEAT ISOLATION from the adjacent electrical cables and components.
(2) Install the aft fire/overheat detector (Ref. AMM TASK 26-12-17-400-803).
(3) Install the loop-A fire harness and the electrical rail assembly (Ref. AMM TASK 26-12-61-400-802).
(4) Install the ECS sense lines:
(a) Remove the PLUG - BLANKING from the open ends of the ECS sense lines.
(b) Install the ECS sense lines connected to the pylon (Ref. AMM TASK 36-11-49-400-823).
(5) Install the ACC hose:
(a) Remove the PLUG - BLANKING from the open ends of the ACC hose.
(b) Install the ACC hose (Ref. AMM TASK 75-24-49-400-803).
(6) Install the PRV:
(a) Remove the COVER - PROTECTION from the open ends of the PRV (4000HA1, 4000HA2).
(b) Install the PRV (4000HA1, 4000HA2) (Ref. AMM TASK 36-11-52-400-802).
(7) Install the ECS starter duct:
(a) Remove the PLUG - BLANKING from the open ends of the ECS starter duct.
(b) Install the ECS starter duct (Ref. AMM TASK 36-11-49-400-822).
(8) Install the overpressure valve:
(a) Remove the COVER - PROTECTION from the open end of the overpressure valve.
(b) Install the overpressure valve (Ref. AMM TASK 36-11-53-400-802).
(9) Make sure that the work area is clean and clear of tools and other items.

Subtask 36-12-00-790-050-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Do a leak test of the bleed-air ducting system (Ref. AMM TASK 36-22-00-790-802).

Subtask 36-12-00-710-082-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Do an operational test of the bleed-air ducting system (Ref. AMM TASK 36-11-00-710-802).

Subtask 36-12-00-860-120-A ** ON A/C NOT FOR ALL

E. 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).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:14:32 UTC