Leak Check of Bleed Air Ducting in the Fuselage Area between the APU Bleed Check Valve, Air Conditioning Pack and Wing/Fuselage Connection

TASK 36-12-00-790-003-A
Leak Check of Bleed Air Ducting in the Fuselage Area between the APU Bleed Check Valve, Air Conditioning Pack and Wing/Fuselage Connection

WARNING: MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.

ZONE: 150
ZONE: 160
ZONE: 190
ZONE: 310

1. Reason for the Job
Refer to the MPD TASK: 361200-03
LEAK CHECK OF BLEED AIR DUCTING IN FUSELAGE AREA BETWEEN APU BLEED CHECK VALVE, AIR CONDITIONING PACK AND WING/FUSELAGE CONNECTION
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
150	AFT CARGO COMPARTMENT FWD PRESS BULKHEAD TO AFT BULKHEAD OF AFT CARGO COMPARTMENT
160	BULK CARGO COMPARTMENT AFT BULKHEAD OF AFT CARGO COMPARTMENT TO AFT BULKHEAD OF BULK CARGO COMPARTMENT
190	BELLY FAIR, AIR CONDITIONING & HYD COMPT
310	FUSLG TAIL SECTION AFT OF AFT PRESS BHD
147AB, 147EB, 147FB, 191BB, 191EB, 191JB, 192EB, 192FB, 192KB, 196AB
197KB
197BB

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 36-12-00-860-002-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 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 53-35-13-000-001-A	Removal of the Belly Fairing Access Panels
TASK 53-35-13-000-002-A	Removal of the Quick-Release Access Panels from the Belly Fairing Structure
TASK 53-35-13-400-001-A	Installation of the Belly Fairing Access Panels
TASK 53-35-13-400-002-A	Installation of the Quick-Release Access Panels on the Belly Fairing Structure
TASK 20-26-00-910-002-A	Installation of Expansion Joints (for corrective action)
APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL
APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL
APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL
APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL
APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL

3. Job Set-up
Subtask 36-12-00-010-054-A ** ON A/C NOT FOR ALL

A. Get Access

APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL

(1) Get access to the APU bleed-air ducts between FR34 and FR36.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191BB, 191EB 192FB and 192EB.
(b) Remove the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-000-002).
(2) Get access to the APU bleed-air ducts between FR36 and FR42.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191JB, 192KB and 196AB.
(b) Remove the access panel 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-000-001).
(3) Get access to the APU bleed-air ducts between FR42 and FR50.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 147AB, 147EB, 147FB and 197BB.
(b) Remove the access panels 147AB, 147EB, 147FB and 197BB (Ref. AMM TASK 53-35-13-000-001).

Subtask 36-12-00-010-054-B ** ON A/C NOT FOR ALL

A. Get Access

APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL

(1) Get access to the APU bleed-air ducts between FR35.5 and FR36.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191BB, 191EB, 192FB and 192EB.
(b) Remove the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-000-002).
(2) Get access to the APU bleed-air ducts between FR36 and FR42.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191JB, 192KB and 196AB.
(b) Remove the access panels 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-000-001).
(3) Get access to the APU bleed-air ducts between FR42 and FR47.3.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 147AB, 147EB, 147FB and 197KB.
(b) Remove the access panels 147AB, 147EB, 147FB and 197KB (Ref. AMM TASK 53-35-13-000-001).

Subtask 36-12-00-010-054-C ** ON A/C NOT FOR ALL

A. Get Access

APU Bleed Air Ducts - Access ** ON A/C NOT FOR ALL

(1) Get access to the APU bleed-air ducts between FR34 and FR36.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191BB, 191EB, 192FB and 192EB.
(b) Remove the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-000-002).
(2) Get access to the APU bleed-air ducts between FR36 and FR42.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 191JB, 192KB and 196AB.
(b) Remove the access panel 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-000-001).
(3) Get access to the APU bleed-air ducts between FR42 and FR54.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the access panels 147AB, 147EB, 147FB and 197BB.
(b) Remove the access panels 147AB, 147EB, 147FB and 197BB (Ref. AMM TASK 53-35-13-000-001).

Subtask 36-12-00-865-057-A

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/ENG 1/CTL	3HA1	D12
49VU	AIR BLEED/ENG 1/MONG	2HA1	D11
** ON A/C ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
** ON A/C NOT FOR ALL
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
** ON A/C ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22
** ON A/C ALL
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20
** ON A/C NOT FOR ALL
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-12-00-860-062-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 (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On the AIR COND panel 30VU, make sure that:

The OFF legends on the PACK 1 and PACK 2 pushbutton switches are on,
the OFF legends of the ENG BLEED pushbutton switches are on,
the X-BLEED selector switch is in the SHUT position.

(4) On the ANTI ICE panel 25VU, make sure that:

The ANTI ICE pushbutton switches are off (the ON legends are off).

Subtask 36-12-00-860-062-B ** 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 (upper ECAM DU and lower ECAM DU only)
(Ref. AMM TASK 31-60-00-860-001).
(3) On AIR COND panel 30VU, make sure that:

The PACK 1 and PACK 2 pushbutton switches are off (OFF legends are on).
The ENG BLEED pushbutton switches are off (OFF legends are on).
The X-BLEED selector switch is in the SHUT position.

(4) On ANTI ICE panel 25VU, make sure that:

The ANTI ICE pushbutton switches are off (ON legends are off).

(5) On CARGO HEAT panel 22VU, make sure that:

The HOT AIR pushbutton switch is off (OFF legend is on).

4. Procedure
Subtask 36-12-00-720-052-A

A. Leak Check of the Bleed Air Ducting

NOTE: You can do the leak test of the bleed air ducting with the APU or with the Ground Connector - HP (7300HM).

(1) Pressurization of the bleed air system with the APU:
(a) 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: 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.

(b) On AIR COND panel 30VU, push the APU BLEED pushbutton-switch (the ON legend comes on).
(c) On the BLEED page of the lower ECAM DU, make sure that the APU bleed-air supply is correct.
(2) Pressurization of the bleed air system with the HP ground connector (7300HM):
(a) Do the pressurization of the bleed system through the HP ground connector (Ref. AMM TASK 36-12-00-860-002).
(3) At the APU bleed-air ducts, make sure that there are no leaks, specially from the clamps and the connections.
(4) If you find a leak:
(a) Remove the related bleed air duct (Ref. AMM TASK 36-12-41-000-001).
(b) Replace the related duct seals (Ref. AMM TASK 36-12-41-400-001) and (Ref. AMM TASK 20-26-00-910-002).
(c) Install the bleed air duct (Ref. AMM TASK 36-12-41-400-001).

5. Close-up
Subtask 36-12-00-860-063-A

A. Put the aircraft back to the serviceable condition.

NOTE: It is necessary to do the applicable depressurization procedure for the APU or the Ground Connector - HP (7300HM).

(1) Stop the pressurization of the bleed air ducting with the APU:
(a) On the AIR COND panel 30VU, push the APU BLEED P/BSW (the OFF legend comes on).
(b) Stop the APU:

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

(c) On the AIR COND panel 30VU, set the X-BLEED selector switch to the AUTO position.
(2) Stop the pressurization of the bleed air ducting with the HP ground connector (7300HM) (Ref. AMM TASK 36-12-00-860-002).
(3) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(4) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-862-002).

Subtask 36-12-00-410-054-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) For the APU bleed-air ducts between FR34 and FR36:
(a) Install the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-400-002).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191BB, 191EB, 192FB and 192EB.
(3) For the APU bleed-air ducts between FR36 and FR42:
(a) Install the access panels 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191JB, 192KB and 196AB.
(4) For the APU bleed-air ducts between FR42 and FR50:
(a) Install the access panels 147AB, 147EB, 147FB and 197BB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 147AB, 147EB, 147FB and 197BB.
(5) Remove the WARNING NOTICE(S).

Subtask 36-12-00-410-054-B ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) For the APU bleed-air ducts between FR35.5 and FR36:
(a) Install the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-400-002).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191BB, 191EB, 192FB and 192EB.
(3) For the APU bleed-air ducts between FR36 and FR42:
(a) Install the access panels 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191JB, 192KB and 196AB.
(4) For the APU bleed-air ducts between FR42 and FR47.3:
(a) Install the access panels 147AB, 147EB, 147FB and 197KB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 147AB, 147EB, 147FB and 197KB.
(5) Remove the WARNING NOTICE(S).

Subtask 36-12-00-410-054-C ** ON A/C NOT FOR ALL

B. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) For the APU bleed-air ducts between FR34 and FR36:
(a) Install the access panels 191BB, 191EB, 192FB and 192EB (Ref. AMM TASK 53-35-13-400-002).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191BB, 191EB, 192FB and 192EB.
(3) For the APU bleed-air ducts between FR36 and FR42:
(a) Install the access panels 191JB, 192KB and 196AB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 191JB, 192KB and 196AB.
(4) For the APU bleed-air ducts between FR42 and FR54:
(a) Install the access panels 147AB, 147EB, 147FB and 197BB (Ref. AMM TASK 53-35-13-400-001).
(b) Remove the ACCESS PLATFORM 2M (6 FT) from below the access panels 147AB, 147EB, 147FB and 197BB.
(5) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:15:25 UTC