Installation of the Bellows

TASK 36-12-42-400-001-A
Installation of the Bellows

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

WARNING: PUT WARNING NOTICES IN THE COCKPIT BEFORE YOU DO WORK ON THE BLEED AIR SYSTEM TO TELL PERSONS:

NOT TO OPERATE THE ENGINES
NOT TO OPERATE THE SLATS
NOT TO OPERATE THE APU SWITCH.

FIN: 7265HM ** ON A/C NOT FOR ALL

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 3M (10 FT)
No specific	AR	CAP - BLANKING
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 0.22 and 0.18 m.daN (19.47 and 15.93 lbf.in )
No specific	Torque wrench: range to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.14QEB1)	Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -

C. Referenced Information

REFERENCE	DESIGNATION
TASK 12-33-21-618-001-A-02	Pre-conditioning with the APU
Bellows (7265HM)

3. Job Set-up
Subtask 36-12-42-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the WARNING NOTICE(S) are in position:

in the cockpit on the Engine Control Panel 115VU to tell persons not to start the engine(s),
in the cockpit on the AIR COND Overhead Control Panel 30VU to tell persons not to push in the APU BLEED pushbutton switch,
on the HP ground connector to tell persons not to pressurize the pneumatic system.

(2) Make sure that the ACCESS PLATFORM 3M (10 FT) is in position below the access door 312AR.
(3) Make sure that the access door 312AR is open.
(4) Make sure that the CAP - BLANKING is installed on the duct sections (1) and (7).

Bellows (7265HM) ** ON A/C NOT FOR ALL

Subtask 36-12-42-865-051-A ** ON A/C NOT FOR ALL

B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
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
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

4. Procedure
Subtask 36-12-42-420-050-A ** ON A/C NOT FOR ALL

A. Installation of the Bellows (7265HM)
(1) Clean the component interfaces and the adjacent area.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Remove the blanking caps from the duct sections (1) and (7).
(4) Put the bellows (5) with the clamps (4) and (6) in the installation position.
(5) Tighten the screws of the clamps (4) and (6).
(6) Install the clamp (3).
(7) TORQUE the nut of the clamp (3) to between 0.5 and 0.4 m.daN (44.25 and 35.40 lbf.in )

.
(8) TORQUE the screws of the clamps (4) and (6) to between 0.22 and 0.18 m.daN (19.47 and 15.93 lbf.in )

.
(9) Safety the screws of the clamps (4) and (6) with the lockwire 14QEB1Wire-Locking Dia: 0.6 mm CRES Nickel Alloy -.

Subtask 36-12-42-865-052-A ** ON A/C NOT FOR ALL

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
49VU	AIR BLEED/X FEED/VALVE/BAT	2HV	D13
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
122VU	AIR BLEED/X FEED VALVE/NORM	1HV	Z20

Subtask 36-12-42-790-050-A ** ON A/C NOT FOR ALL

C. Leak Test of the Pneumatic Connections
(1) Do the ground air pre-conditioning with the APU (Ref. AMM TASK 12-33-21-618-001).
(2) Make sure that there are no leaks between the connections of the bellows (5) and the duct sections (1) and (7).
(3) Install the sleeve (2), if removed.

5. Close-up
Subtask 36-12-42-860-052-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to the serviceable condition.
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access door 312AR.
(3) Remove the access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:15:33 UTC