Decontamination of the Bleed-Air Ducting System Disconnected at the APU Load-Compressor Valve with the HP Ground Source

TASK 36-13-00-615-805-A
Decontamination of the Bleed-Air Ducting System Disconnected at the APU Load-Compressor Valve with the HP Ground Source

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: 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: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

CAUTION: MAKE SURE THAT THE GROUND-AIR SUPPLY IS FREE FROM OIL CONTAMINATION. OIL CONTAMINATION CAN CAUSE THE SMELL OF OIL IN THE CABIN AND MAKE THE AIR-CONDITIONING PACKS UNSERVICEABLE.

CAUTION: MAKE SURE THAT THE GROUND AIR-SUPPLY UNIT IS NOT TOO NEAR THE AIRCRAFT AND THAT THE ENGINE EXHAUST PIPE OF THE GROUND AIR- SUPPLY UNIT POINTS AWAY FROM THE AIRCRAFT. HEAT FROM THIS UNIT AND FROM THE EXHAUST CAN CAUSE DAMAGE TO THE AIRCRAFT STRUCTURE.

ZONE: 191
ZONE: 197
ZONE: 211

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	GROUND AIR-SUPPLY UNIT(HIGH PRESSURE)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)
98D36109005001	1	DUMMY CHECK VLV - APU
98D36109006000	1	BLEED EXHAUST - APU

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
191	AIR CONDITIONING COMPT AND FAIRINGS
197	REAR FAIRING
211	COCKPIT
191DB, 197KB

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 36-12-00-860-806-A	Pressurization of the Bleed System through the HP Ground Connector
TASK 36-12-41-000-001-A	Removal of a Bleed-Air Duct
TASK 36-12-41-400-001-A	Installation of a Bleed-Air Duct
TASK 36-12-51-000-001-A	Removal of the APU Bleed Check-Valve
TASK 36-12-51-400-001-A	Installation of the APU Bleed Check-Valve
TASK 36-22-00-790-803-A	Leak Check on all the Bleed Air Ducts and the Pack Components
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-00-410-001-A	Close the APU Doors after Access
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
APU Bleed Exhaust - Installation
Dummy Check Valve - Installation
Bleed-Air Ducting System - Location and Detail
Bleed Page
HP Ground Connector

3. Job Set-up
Subtask 36-13-00-860-052-A

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) 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 in the LO position.
(e) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system on the bleed pushbutton switches.
(4) In the cockpit, on OVERHEAD CTL & IND panel 25VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start the APU.
(5) In the cockpit, on ENG panel 115VU:
(a) Put the WARNING NOTICE(S) in position to tell persons not to start engine 1 and 2.

Subtask 36-13-00-865-054-A

B. Open, safety and tag this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

Subtask 36-13-00-480-051-B

C. Preparation for the Cleaning of Bleed-Air Ducting System
(1) Install the 98D36109006000 BLEED EXHAUST - APU as follows:
(a) Open the APU doors for access (Ref. AMM TASK 52-41-00-010-001).

(b) Disconnect the bleed-air ducting system from the APU load-compressor valve (Ref. AMM TASK 36-12-41-000-001).
(c)

APU Bleed Exhaust - Installation

NOTE: You can change the bleed duct orientation to install the tool easily.

(d) Install the PLUG - BLANKING to the open end of the APU load-compressor valve.
(e) Make sure that the bleed air is pointed away from the aircraft.
(2) Install the 98D36109005001 DUMMY CHECK VLV - APU as follows:
(a) Remove access panel 197KB (Ref. AMM TASK 53-35-13-000-002).
(b) Remove the APU bleed check-valve (Ref. AMM TASK 36-12-51-000-001).
(c)

Dummy Check Valve - Installation

4. Procedure
Subtask 36-13-00-615-051-A

A. Cleaning of the Odor Smell in the Bleed-Air Ducting System
(1) Open access door 191DB.
(2) Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the HP ground connector (7300HM).
(3) In the cockpit, on AIR COND panel 30VU:
(a) Set the X BLEED selector switch to the SHUT position.
(4) 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 in the closed position.
(5) Start the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) (Ref. AMM TASK 36-12-00-860-806).
(6) Wait for a minimum of 15 minutes.
(7) 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.

(8) Stop the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE).
(9) In the cockpit, on AIR COND panel 30VU:
(a) Set the X BLEED selector switch to the AUTO position.
(10) Disconnect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) from the HP ground connector (7300HM).
(11) Close access door 191DB.

5. Close-up
Subtask 36-13-00-080-051-B

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the 98D36109005001 DUMMY CHECK VLV - APU as follows:

NOTE: After this procedure, the 98D36109005001 DUMMY CHECK VLV - APU will be hot to touch.

(a) Get access to the APU bleed-check-valve position.
(b)

APU Bleed Exhaust - Installation

(c) Install the APU bleed check-valve (Ref. AMM TASK 36-12-51-400-001).
(d) Install access panel 197KB (Ref. AMM TASK 53-35-13-400-002).
(3) Remove the 98D36109006000 BLEED EXHAUST - APU as follows:

NOTE: After this procedure, the 98D36109006000 BLEED EXHAUST - APU will be hot to touch.

(a)

APU Bleed Exhaust - Installation

(b) Remove the PLUG - BLANKING from the open end of the APU load-compressor valve.
(c) Connect the bleed-air ducting system to the APU load-compressor valve (Ref. AMM TASK 36-12-41-400-001).
(d) Close the APU doors after access (Ref. AMM TASK 52-41-00-410-001).

Subtask 36-13-00-865-055-A

B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

Subtask 36-13-00-790-051-A

C. Leak Test
(1) Do a leak test of the bleed-air ducting system (Ref. AMM TASK 36-22-00-790-803):
(a) Make sure that there are no leaks.

Subtask 36-13-00-860-053-A

D. Aircraft Maintenance Configuration
(1) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(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).
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 12:37:21 UTC