Removal of the Wing Bellow

TASK 36-11-49-000-841-A
Removal of the Wing Bellow

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

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: 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.

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	1	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	2	CAP - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	2	TIE WRAP(S)
No specific	AR	WARNING NOTICE(S)
98D27803000000	1	LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION
98L12003001000	1	HARNESS,SAFETY

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
191DB
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-01	Energize the Aircraft Electrical Circuits from the APU
TASK 27-00-00-480-002-A	Installation of the Flap/Slat Control-Lever Locking Tool (98D27803000000)
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 54-53-11-000-804-A	Removal of the Pylon-to-Wing Access Panels and Doors
TASK 71-00-00-860-833-A	Procedure to Prevent Engine Motoring
TASK 78-30-00-040-805-A	Deactivation of the Thrust Reverser System for Ground Maintenance
Wing Bellow

3. Job Set-up
Subtask 36-11-49-861-138-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 36-11-49-941-156-A ** ON A/C NOT FOR ALL

B. Safety Precautions
(1) Make sure that the engine shutdown occurred five minutes or more before you do this procedure.
(2) On AIR COND panel 30VU:
(a) Make sure that the ENG 1(2) BLEED pushbutton switch is released (OFF legend on).
(b) Make sure that the APU BLEED pushbutton switch is released (ON legend off).
(c) Put a WARNING NOTICE(S) in position to tell persons not to operate the pneumatic system.
(3) Do the procedure to prevent engine motoring
(Ref. AMM TASK 71-00-00-860-833).
(4) On the access door 191DB, on the HP ground connector:
(a) Put a WARNING NOTICE(S) in position to tell persons not to pressurize the pneumatic system.
(5) On FLAPS panel 114VU:

Put the 98D27803000000 LOCKING TOOL-FLAP SLAT LEVER,INT. POSITION in position on the flap/slat control lever (Ref. AMM TASK 27-00-00-480-002).
Put a WARNING NOTICE(S) on the flap/slat control lever to tell persons not to operate the flap/slat controls.

Subtask 36-11-49-865-247-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
FOR FIN: 4020KM1 (POWER PLANTDEMOUNTABLE, ENG 1)
49VU	AIR BLEED/ENG 1/CTL	2HA1	D11
122VU	AIR BLEED/ENG 1/MONG	3HA1	Z23
FOR FIN: 4020KM2 (POWER PLANTDEMOUNTABLE, ENG 2)
49VU	AIR BLEED/ENG 2/MONG	3HA2	D12
122VU	AIR BLEED/ENG 2/CTL	2HA2	Z22

Subtask 36-11-49-040-187-A ** ON A/C NOT FOR ALL

D. Deactivate the Thrust Reverser

WARNING: MAKE SURE THAT THE THRUST REVERSER HYDRAULIC CONTROL UNIT (HCU) IS DEACTIVATED BEFORE YOU DO WORK ON OR AROUND THE THRUST REVERSER. IF THE HCU IS NOT DEACTIVATED, THERE IS A RISK OF UNWANTED THRUST REVERSER OPERATION WHICH CAN CAUSE INJURY TO PERSONS AND/OR DAMAGE TO EQUIPMENT.

(1) Deactivate the thrust reverser system for ground maintenance (Ref. AMM TASK 78-30-00-040-805).

Subtask 36-11-49-010-306-A ** ON A/C NOT FOR ALL

E. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the fan cowl doors.
(2) Put on and attach a 98L12003001000 HARNESS,SAFETY before you start work in the work area.
(3) Open the pylon access panel (Ref. AMM TASK 54-53-11-000-804):
(a) FOR [4020KM1] (POWER PLANT-DEMOUNTABLE, ENG 1)
413ET
(b) FOR [4020KM2] (POWER PLANT-DEMOUNTABLE, ENG 2)
423ET

4. Procedure
Subtask 36-11-49-020-173-A ** ON A/C NOT FOR ALL

A. Removal of the Wing Bellow
(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).

CAUTION: BE CAREFUL NOT TO CAUSE DAMAGE TO THE SENSING ELEMENT.

(3) Remove the insulation muff (1) and examine it for damages:
(a) Discard the wing insulation muff, if it has one of the damages that follows:

Holes more than 5mm of diameter in the hot face of the muff.
Cracks more than 10mm long in the hot face of the muff.
Brown or the black sign of thermal stress at the muffs hot face that covers a minimum of 20% of its surface.
General rigidity of the insulation muff.

(4) Loosen and remove the clamp (7).
(5) Compress the wing bellow (2) with TIE WRAP(S).
(6) Remove and discard the seal (6).
(7) Hold the wing bellow (2).
(8) Loosen and remove the clamp (4).
(9) Remove the wing bellow (2) from the aircraft.
(10) Put CAP - BLANKING in position on the ducts (3) and (5).

[Rev.10 from 2021] 2026.04.01 12:38:42 UTC