Installation of the Sealing Ring (Bellows) (APS 3200)

TASK 49-81-42-400-002-A
Installation of the Sealing Ring (Bellows) (APS 3200)

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.22 and 0.2 m.daN (19.47 and 17.70 lbf.in )

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-81-41-400-002-A	Installation of the Exhaust Muffler (APS 3200)
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-00-410-001-A	Close the APU Doors after Access
TASK 52-41-18-400-001-A	Installation of the APU Exhaust Access-Fairing
Sealing Ring (Bellows)

3. Job Set-up
Subtask 49-81-42-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (Ref. AMM TASK 24-41-00-861-002).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Make sure that there is a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(5) Make sure that the access platform is in position below the APU compartment.
(6) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(7) Make sure that the LIGHT control switch 11LJ is set to the on position.

Subtask 49-81-42-865-054-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
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

4. Procedure
Subtask 49-81-42-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Sealing Ring (Bellows).
(1) Examine the piston ring (6) for damage or wear. Replace the piston ring if necessary.
(2) Examine the (hot) nozzle (1) and the sealing ring (bellows) (3) for damage, chafing marks or cracks. Replace the (hot) nozzle (1) and the sealing ring (bellows) (3) if necessary.
(3) Install the sealing ring (bellows) (3) on the exhaust muffler (5).
(4) Install the clamp (4) on the sealing ring (bellows) (3).
(5) TORQUE the clamp (4) to between 0.22 and 0.2 m.daN (19.47 and 17.70 lbf.in )

.
(6) Install the hot nozzle (1) on the piston ring (6).
(7) Put the drain line (7) in the six o'clock position.
(8) Install the clamp (2) on the sealing ring (bellows) (3).
(9) TORQUE the clamp (2) to between 0.22 and 0.2 m.daN (19.47 and 17.70 lbf.in )

5. Close-up
Subtask 49-81-42-410-051-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Install the exhaust muffler (Ref. AMM TASK 49-81-41-400-002).
(2) Make sure that the work area is clean and clear of tools and other items.
(3) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Install the APU exhaust access fairing 317AL (Ref. AMM TASK 52-41-18-400-001).
(5) Remove the access platform(s).

Subtask 49-81-42-865-055-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
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-81-42-860-052-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:32:44 UTC