Removal of the Oil-Cooler Transfer Tubes (131-9(A))

TASK 49-91-44-000-802-A
Removal of the Oil-Cooler Transfer Tubes (131-9(A))

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.

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 for APU PRE SN P-6824 and PRE Honeywell SB 131-49-8205
Oil-Cooler Transfer Tubes for APU POST SN P-6824, or for APU PRE SN P-6824 and POST Honeywell SB 131-49-8205

3. Job Set-up
Subtask 49-91-44-860-067-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 49-91-44-865-077-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 49-91-44-010-062-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 and 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control SW 11LJ to the ON position.

4. Procedure
Subtask 49-91-44-020-055-A ** ON A/C NOT FOR ALL

A. Removal of the Oil Tubes
(1) Removal of the Oil Tubes for APU PRE SN P-6824 and PRE Honeywell SB 131-49-8205:

Oil-Cooler Transfer Tubes for APU PRE SN P-6824 and PRE Honeywell SB 131-49-8205 ** ON A/C NOT FOR ALL

NOTE: The following procedure can be used to remove one or both Oil Tubes.

(a) Put the CONTAINER 10 L(2 1/2 USGAL) below the bypass valve (5).
(b) Loosen the nuts (6) from the oil tubes clamps (3) and (8).
(c) Turn the clamps (3) and (8) to free the oil tubes (1) and (2).
(d) Pull the Oil Supply Tube (1) and Oil Return Tube (2) out of the gear box housing (9) and the bypass valve (5).
(e) Remove and discard the packings (7) and (4).

NOTE: The packings (7) and (4) must be discarded and replaced for new packings.

(f) Put the blanking plugs on the oil tubes (1) and (2), the bypass valve (5) and the gear box housing (9).
(2) Removal of the Oil Supply and Return Tubes for APU POST SN P-6824, or for APU PRE SN P-6824 and POST Honeywell SB 131-49-8205:

Oil-Cooler Transfer Tubes for APU POST SN P-6824, or for APU PRE SN P-6824 and POST Honeywell SB 131-49-8205 ** ON A/C NOT FOR ALL

NOTE: This procedure is applicable to the removal of one or the two oil tubes.

(a) Put the CONTAINER 10 L(2 1/2 USGAL) below the bypass valve (7).
(b) Remove the nuts (17), the bolts (14) and the bracket (15) to release the clamps (16).
(c) Remove the clamps (16) from the oil supply tube (2) and the oil return tube (1).
(d) Remove the nut (13), the bolt (10) and the spacer (12) to release the clamps (11).
(e) Remove the clamps (11) from the oil supply tube (2) and the oil return tube (1).
(f) Remove the nuts (3) from the oil-cooler tube retainer (4) and gearbox tube retainer (9).
(g) Remove the oil-cooler tube retainer (4) and the gearbox tube retainer (9) to release the oil supply tube (2) and the oil return tube (1).
(h) Pull the oil supply tube (2) and the oil return tube (1) out of the gear box housing (8) and the bypass valve (7).
(i) Remove and discard the packings (5) and (6).
(j) Put PLUG - BLANKING on the oil supply tube (2), the oil return tube (1), the bypass valve (7) and the gearbox housing (8).

[Rev.10 from 2021] 2026.04.01 01:33:30 UTC