Visual Check of the Sealing-Ring Coupling Bellows (APS 3200)

TASK 49-81-00-200-005-A
Visual Check of the Sealing-Ring Coupling Bellows (APS 3200)

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

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	SAFETY CLIP - CIRCUIT BREAKER
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 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
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
APU Exhaust Coupling - External

3. Job Set-up
Subtask 49-81-00-860-053-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).
(2) On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3) Put 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).

Subtask 49-81-00-865-058-A ** ON A/C NOT FOR ALL

B. Open, safety and tag 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 49-81-00-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 3M (10 FT) in position below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Select the LIGHT control switch 11LJ to the on position.

4. Procedure
Subtask 49-81-00-210-056-A ** ON A/C NOT FOR ALL

A. Inspection
(1) Examine the two bellows band clamps for security of attachment and damage. Loose clamps must be repositioned and tightened, damaged clamps must be replaced (Ref. AIPC 49-81-41-01-020) and /or (Ref. AIPC 49-81-41-01-030).
(2) Examine the exhaust coupling bellows assembly for distortion, cracks and holes, burning and delamination. Replace the bellows assembly if found defective (Ref. AIPC 49-81-41-01-040).

NOTE: If the band clamps require to be replaced or repositioned and tightened, torque both clamp lockbolts to between 0.22 and 0.2 m.daN (19.47 and 17.70 lbf.in )

5. Close-up
Subtask 49-81-00-410-054-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Set the LIGHT control switch 11LJ to the off position.
(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) Remove the access platform(s).
(5) Remove the WARNING NOTICE(S).

Subtask 49-81-00-865-059-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 49-81-00-860-050-A ** ON A/C NOT FOR ALL

C. Aircraft Maintenance Configuration.
(1) De-energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).

[Rev.10 from 2021] 2026.04.01 01:32:30 UTC