Removal of the Oil-Cooler Transfer Tubes (APS3200)

TASK 49-91-44-000-803-A
Removal of the Oil-Cooler Transfer Tubes (APS3200)

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

WARNING: AVOID PROLONGED EXPOSURE TO ENGINE OIL ON YOUR SKIN FLUSH OIL FROM YOUR SKIN WITH WATER. WEAR PROTECTIVE CLOTHING, GOGGLES AND FACE MASK. OIL IS POISONOUS AND CAN PENETRATE YOUR SKIN AND INTO YOUR BODY.

WARNING: LOCK THE MECHANISM OF THE ACCESS DOOR 316AR WITH THE PIP PIN WHEN YOU OPEN THE ACCESS DOOR. THIS WILL PREVENT INJURY.

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

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	1	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
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
Oil-Cooler Transfer Tubes (APS3200)

3. Job Set-up
Subtask 49-91-44-860-073-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3) Put a WARNING NOTICE(S) 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 49-91-44-865-082-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 49-91-44-010-065-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE in position below the APU access doors 315AL and 316AR.
(2) Open APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the light switch 11LJ to the ON position.

4. Procedure
Subtask 49-91-44-020-056-G ** ON A/C NOT FOR ALL

A. Removal of the Oil-Cooler Transfer Tubes
(1) Put the CONTAINER 10 L(2 1/2 USGAL) below the inlet and outlet mount bosses.
(2) Remove the nut (13) and the bolt (12) from the clamp (14).
(3) Turn the clamp (14) to free the tube (5).
(4) Remove the nuts (6).
(5) Disconnect the tube (5) and discard the packing (7).
(6) Disconnect the other end (11).
(7) Remove the tube (5).
(8) Remove the nuts (1).
(9) Disconnect the tube (2) and discard the packing (3).
(10) Disconnect the other end (8).
(11) Remove the union (9) and discard the packing (10).
(12) Remove the tube (2).
(13) Put the PLUG-BLANKING in each disconnected line end.

[Rev.10 from 2021] 2026.04.01 01:33:24 UTC