Perform Leak Check on the Combo Seals on the Pylon Duct Sleeves (Downstream Precooler)

TASK 36-11-00-790-002-B-01
Perform Leak Check on the Combo Seals on the Pylon Duct Sleeves (Downstream Precooler)

WARNING: MAKE SURE THAT THE SAFETY DEVICES AND THE WARNING NOTICES ARE IN POSITION BEFORE YOU START A TASK ON OR NEAR:

THE FLIGHT CONTROLS
THE FLIGHT CONTROL SURFACES
THE LANDING GEAR AND RELATED DOORS
COMPONENTS THAT MOVE.

MOVEMENT OF COMPONENTS CAN KILL OR CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

WARNING: BE CAREFUL WHEN YOU DO WORK ON THE ENGINE PARTS AFTER THE ENGINE SHUTDOWN. USE APPLICABLE THERMAL GLOVES. THE ENGINE PARTS CAN STAY HOT FOR ONE HOUR AFTER SHUTDOWN AND CAN BURN YOU.

WARNING: MAKE SURE THAT THE PNEUMATIC SYSTEM IS DEPRESSURIZED BEFORE YOU START WORK. PRESSURIZED AIR CAN CAUSE INJURY TO PERSONNEL.

ZONE: 410
ZONE: 420

1. Reason for the Job
Refer to the MPD TASK: 361100-06
PERFORM LEAK CHECK ON THE COMBO SEALS ON THE PYLON DUCT SLEEVES (DOWNSTREAM PRECOOLER)
This procedure is applicable when you cannot start the APU.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	AR	ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE
No specific	1	GROUND AIR SUPPLY 0 TO 3.5 BAR (50.76 PSI)
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
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413ET
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423ET

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-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-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 36-22-00-790-802-A	Leak Check on all the Bleed Air Ducts and the Packs Components
TASK 52-41-00-010-002-A	Open the Avionics Compartment Doors for Access
TASK 52-41-00-410-002-A	Close the Avionics Compartment Doors after Access
Combo Seals of the Pylon Duct Sleeves (Downstream Precooler)
FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
TASK 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
TASK 54-53-11-400-804-A	Installation of the Pylon-to-Wing Access Panels and Doors
FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
TASK 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
TASK 54-53-11-400-804-A	Installation of the Pylon-to-Wing Access Panels and Doors

3. Job Set-up
Subtask 36-11-00-860-211-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (ECAM system only) (Ref. AMM TASK 31-60-00-860-001).

Subtask 36-11-00-941-174-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occurred for not less than five minutes before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on).
(b) Make sure that the PACK 1(2) pushbutton switch is released (the OFF legend is on).
(c) Make sure that the PACK FLOW selector-switch is set to LO.
(d) Make sure that the APU BLEED pushbutton-switch is released (the ON legend is off).
(e) Set the X BLEED selector switch to the OPEN position.
(3) On the ENG section of maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off.
(b) Put a WARNING NOTICE(S) in position to tell persons not to energize the FADEC 1(2).
(4) On ENG control panel 115VU:
(a) Put a WARNING NOTICE(S) in position to tell persons not to start the engine 1(2).
(5) On the ANTI ICE section of panel 25VU:

Make sure that the ANTI-ICE WING pushbutton-switch is released (the ON legend is off).

Subtask 36-11-00-010-239-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below access door 811.
(2) Open access door 811 (Ref. AMM TASK 52-41-00-010-002).
(3) Put a WARNING NOTICE(S) in position to tell persons not to close access door 811.

Subtask 36-11-00-865-190-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
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: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
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 36-11-00-010-240-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) - ADJUSTABLE in position below the applicable pylon access panel.
(2) Remove the applicable access panel(s):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)

413ET (Ref. AMM TASK 54-53-11-000-804).

(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)

423ET (Ref. AMM TASK 54-53-11-000-804).

(3) Remove the insulation from the pylon duct sleeves.

Combo Seals of the Pylon Duct Sleeves (Downstream Precooler) ** ON A/C NOT FOR ALL

Subtask 36-11-00-480-138-A ** ON A/C NOT FOR ALL

F. Preparation for the Leak Check
(1) Connect the GROUND AIR SUPPLY 0 TO 3.5 BAR (50.76 PSI) to HP ground connector (7300HM).
(2) On the ECAM control panel, push the BLEED key:

On the SD, the BLEED page comes into view.

(3) Start the GROUND AIR SUPPLY 0 TO 3.5 BAR (50.76 PSI):

Make sure that the supplied air pressure is not more than 44 psi (3.03 bar).

4. Procedure
Subtask 36-11-00-790-072-A ** ON A/C NOT FOR ALL

A. Leak Check on the Combo Seals on the Pylon Duct Sleeves (Downstream Precooler)
(1) On the BLEED page of the SD:

Make sure that the bleed valves are shown closed and are in green.
Make sure that the crossbleed valve is shown open and is in green.

(2) Make sure that there are no leaks at the combo seals of the pylon duct sleeves (Ref. AMM TASK 36-22-00-790-802).
(3) Stop the GROUND AIR SUPPLY 0 TO 3.5 BAR (50.76 PSI).

5. Close-up
Subtask 36-11-00-860-212-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Set the X BLEED selector switch to the AUTO position.
(2) Disconnect the GROUND AIR SUPPLY 0 TO 3.5 BAR (50.76 PSI) from the HP ground connector (7300HM).

Subtask 36-11-00-410-237-A ** ON A/C NOT FOR ALL

B. Close Access
(1) Install the insulation on the pylon duct sleeve(s).

Combo Seals of the Pylon Duct Sleeves (Downstream Precooler) ** ON A/C NOT FOR ALL

(2) Make sure that the work area is clean and clear of tools and other items.
(3) Install the applicable access panel(s):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)

413ET (Ref. AMM TASK 54-53-11-400-804).

(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)

423ET (Ref. AMM TASK 54-53-11-400-804).

Subtask 36-11-00-410-232-A ** ON A/C NOT FOR ALL

C. Close Access
(1) Remove the WARNING NOTICE(S).
(2) Close access door 811 (Ref. AMM TASK 52-41-00-410-002).
(3) Remove the access platform(s).

Subtask 36-11-00-860-205-A ** ON A/C NOT FOR ALL

D. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure (Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002) (Ref. AMM TASK 24-41-00-862-002).

[Rev.10 from 2021] 2026.04.01 01:07:33 UTC