Removal of the Oil Cooler (APS 3200)

TASK 49-91-44-000-003-A
Removal of the Oil Cooler (APS 3200)

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

WARNING: USE PROTECTIVE GOGGLES AND GLOVES WHEN YOU REMOVE OR INSTALL LOCKWIRE. EACH TIME YOU CUT LOCKWIRE, REMOVE AND DISCARD IT IMMEDIATELY. LOOSE LOCKWIRE CAN CUT YOU OR MAKE YOU BLIND, AND/OR CAN CAUSE DAMAGE.

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	COVER - PROTECTION
No specific	AR	PLUG - BLANKING
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

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
Oil Cooler

3. Job Set-up
Subtask 49-91-44-860-050-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 49-91-44-865-063-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 49-91-44-010-056-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE 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) Set the LIGHT control switch 11LJ to the on position.

4. Procedure
Subtask 49-91-44-020-052-B ** ON A/C NOT FOR ALL

A. Removal of the Oil Cooler with nut connection
(1) Remove the V-band clamp (9) and disconnect the outlet duct (8) from the exhaust duct (10).
(2) Put a CONTAINER 10 L(2 1/2 USGAL) in position below the oil cooler (5).
(3) Remove the drain plug (11) together with the packing (12) and drain the oil cooler (5) into the container.
(4) Discard the packing (12).
(5) Remove the nuts (1) and (13).
(6) Withdraw the oil tube assemblies (2) and (14) and the packings (3) and (15) from the inlet and outlet mount bosses.
(7) Discard the packings (3) and (15).
(8) Put the PLUG-BLANKING in each disconnected line end.
(9) Remove the band clamp (7) and remove the outlet duct (8).
(10) Remove the band clamp (4).
(11) Remove the four mount bolts (6).
(12) Remove the oil cooler (5) from the cooling fan outlet duct (16).
(13) Install a COVER - PROTECTION on the cooling fan outlet duct (16).

[Rev.10 from 2021] 2026.04.01 01:33:26 UTC