Removal of the Pylon Bleed-Air Ducts

TASK 36-11-49-000-041-A
Removal of the Pylon Bleed-Air Ducts

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

WARNING: PUT THE SAFETY DEVICES AND THE WARNING NOTICES IN POSITION BEFORE YOU START A TASK ON OR NEAR:

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

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

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	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
413CL, 413DL, 414CR, 414FR, 423CL, 423DL, 423FL, 424CR

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 36-11-42-000-001-A	Removal of the Bleed-Air Precooler Exchanger
TASK 36-11-43-000-001-A	Removal of the Fan-Air Valve Control-Thermostat
TASK 36-11-55-000-001-A	Removal of the Bleed-Pressure-Regulator Valve Control-Solenoid
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))
Pylon Bleed-Air Ducts

3. Job Set-up
Subtask 36-11-49-861-052-A ** ON A/C NOT FOR ALL

A. Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002) or (Ref. AMM TASK 24-41-00-861-002).

Subtask 36-11-49-941-077-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine 1(2) shutdown occured not less than 5 minutes before you do this procedure.
(2) On the AIR COND panel 30VU:

make sure that the ENG 1(2) BLEED pushbutton switch is released (the OFF legend is on),
make sure that the APU BLEED pushbutton switch is released (the ON legend is off),
put a WARNING NOTICE(S) to tell persons not to operate the pneumatic system.

(3) On the ENG panel 115VU:

put a WARNING NOTICE(S) to tell persons not to start the engine 1(2).

(4) On the HP ground connector:

put a WARNING NOTICE(S) to tell persons not to pressurize the pneumatic system.

(5) On the ENG section of the maintenance panel 50VU:

make sure that the ON legend of the ENG/FADEC GND PWR 1(2) pushbutton switch is off,
put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).

Subtask 36-11-49-865-076-A ** ON A/C NOT FOR ALL

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

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
122VU	AIR BLEED/ENG 2/CTL	3HA2	Z23
122VU	AIR BLEED/ENG 2/MONG	2HA2	Z22

Subtask 36-11-49-010-067-A ** ON A/C NOT FOR ALL

D. Get Access
(1) Put the ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE below the engine.
(2) Remove these access panels:
(a) For the left pylon:

413CL 414CR 413DL 414FR.

(b) For the right pylon:

423CL 424CR 423DL 423FL.

(3) Remove the bleed-air precooler exchanger (Ref. AMM TASK 36-11-42-000-001).
(4) Remove the bleed pressure-regulator valve control-solenoid (Ref. AMM TASK 36-11-55-000-001).
(5) Remove the fan-air valve-control thermostat (Ref. AMM TASK 36-11-43-000-001).

4. Procedure
Subtask 36-11-49-020-068-A ** ON A/C NOT FOR ALL

A. Removal of the Pylon Bleed-Air Ducts
(1) If you use the APU to energize the electrical circuits, 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).

(2) In the cockpit, on the SD bleed page:
(a) Make sure that the pressure and the temperature of the bleed-air duct system are in ambient conditions.

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

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

(3) Remove the nuts (10), the bolts (8) and the washers (9).
(4) Remove the aft pipe of the exchanger (11).

Subtask 36-11-49-020-072-B ** ON A/C NOT FOR ALL

B. Removal of the Clamp
(1) Remove the nut (12) and the tab (13).
(2) Remove the clamp (7).

Subtask 36-11-49-020-069-E ** ON A/C NOT FOR ALL

C. Removal of the Expansion Joints
(1) Remove the two expansion joints (6).
(2) Remove and discard the seal (4) from the expansion joints (6).

Subtask 36-11-49-020-073-A ** ON A/C NOT FOR ALL

D. Removal of the Wing Connection Sleeve
(1) Loosen the clamp (2) and remove it.
(2) Remove the wing connection sleeve (3).
(3) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 01:09:56 UTC