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

TASK 49-91-44-400-802-A
Installation 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.

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

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	WARNING NOTICE(S)
No specific	Torque wrench: range to between 42.0 and 38.0 lbf.in (0.47 and 0.43 m.daN )
No specific	Torque wrench: range to between 45.0 and 40.0 lbf.in (0.51 and 0.45 m.daN )
No specific	Torque wrench: range to between 52.5 and 47.5 lbf.in (0.59 and 0.54 m.daN )
No specific	Torque wrench: range to between 0.51 and 0.45 m.daN (45.13 and 39.82 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03ABA1)	Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.03ABB1)	Synthetic base Lubricating Oil-Turbine Engine Low Temp. -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	PACKING	AIPC 49-21-09-03-050
5	PACKINGS	AIPC 49-21-09-03-050
6	PACKINGS	AIPC 49-21-09-03-050
7	PACKING	AIPC 49-21-09-03-050
4	PACKING	AIPC 49-21-84-30-120
5	PACKINGS	AIPC 49-21-84-30-120
6	PACKINGS	AIPC 49-21-84-30-120
7	PACKING	AIPC 49-21-84-30-120

E. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (131-9(A))
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
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 49-91-44-860-068-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 OFF.
(3) Make sure that there is 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 49-91-44-865-078-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

Subtask 49-91-44-010-063-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Make sure that the access platform is in position below the APU compartment.
(2) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(3) Make sure that the LIGHT control SW 11LJ is set to the ON position.

4. Procedure
Subtask 49-91-44-420-056-A ** ON A/C NOT FOR ALL

CAUTION: WHEN YOU INSTALL THE OIL COOLER OR THE TUBES, MAKE SURE THAT THE TUBES ARE FULLY AND TIGHTLY INSTALLED IN THE OIL COOLER OR GEARBOX MATING HOUSINGS. IF YOU DO NOT OBEY THIS INSTRUCTION, THERE IS A RISK THAT OIL LEAKAGE CAUSES A SMELL IN THE CABIN.

A. Installation of the Oil Tubes

NOTE: More lubrication on the o-rings and housing during assembly will help with full installation of tubes and the housing.

(1) Installation 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

(a) Remove the blanking plugs from the oil tubes (1) and (2), the bypass valve (5) and the gear box housing (9).
(b) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 49-21-09-03-050 PACKING (7) or AIPC 49-21-84-30-120 PACKING (7) and to the new AIPC 49-21-09-03-050 PACKING (4) or AIPC 49-21-84-30-120 PACKING (4).
(c) Install the new packings (7) and (4) on the oil tubes (1) and (2).
(d) Install the Oil Return Tube (2) and Oil Supply Tube (1) into the gear box housing (9) and bypass valve (5).

NOTE: The Oil Supply Tube and the Oil Return Tube are installed in one orientation only, due to different angles at the tube ends.

(e) Make sure that the Oil Return Tube (2) and Oil Supply Tube (1) are connected to their correct connections in the bypass valve (5).
(f) Turn the tube clamps (3) and (8) to lock the tubes in the Oil Cooler.
(g) TORQUE the nuts (6) to between 0.51 and 0.45 m.daN (45.13 and 39.82 lbf.in )

.
(2) Installation 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

(a) Remove the PLUG-BLANKING from each disconnected line end.
(b) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 49-21-09-03-050 PACKINGS (6) or AIPC 49-21-84-30-120 PACKINGS (6).
(c) Install the new packings (6) on the oil supply tube (2).
(d) Turn the oil supply tube (2) to the correct direction. Push the tube end into the inboard port of the oil-cooler bypass valve identified as OIL IN. Push the other end into the gearbox housing outboard-port.
(e) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 49-21-09-03-050 PACKINGS (5) or AIPC 49-21-84-30-120 PACKINGS (5).
(f) Install the new packings (5) on the oil return tube (1).
(g) Turn the oil return tube (1) to the correct direction. Push the tube end into the outboard port of the oil-cooler bypass valve identified as OIL OUT. Push the other end into the gearbox housing inboard-port.
(h) Install the gearbox tube retainer (9) on the top of the two tube flanges on the gearbox side. Hold the retainer and lightly tighten the nuts (3) in the studs.
(i) Install the oil-cooler tube retainer (4) on top of the two tube flanges on the oil cooler side. Hold the retainer and lightly tighten the nuts (3) in the studs.
(j) TORQUE the nuts (3) to between 45.0 and 40.0 lbf.in (0.51 and 0.45 m.daN )

.
(k) Install the clamps (16) around the vertical rigid sections of the oil supply tube (2) and the oil return tube (1) at the ends of the tubes, on the bypass valve side.
(l) Install the clamps (11) around the vertical rigid sections of the oil supply tube (2) and the oil return tube (1) at the ends of the tubes, on the gearbox side.
(m) Install the bracket (15) between the two clamps (16) with the bolts (14) and nuts (17).
(n) TORQUE the nuts (17) to between 42.0 and 38.0 lbf.in (0.47 and 0.43 m.daN )

if the bolts (14) are attached or
(o) TORQUE the bolts (14) to between 52.5 and 47.5 lbf.in (0.59 and 0.54 m.daN )

if the nuts (17) are attached.
(p) Install the spacer (12) between the two clamps (11) with the bolt (10) and nut (13).
(q) TORQUE the nut (13) to between 42.0 and 38.0 lbf.in (0.47 and 0.43 m.daN )

if the bolt (10) is attached or
(r) TORQUE the bolt (10) to between 52.5 and 47.5 lbf.in (0.59 and 0.54 m.daN )

if the nut (13) is attached.

Subtask 49-91-44-865-079-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 49-91-44-710-055-A ** ON A/C NOT FOR ALL

C. Leak Test
(1) Start the APU to circulate oil through the Oil Cooler (Ref. AMM TASK 49-00-00-860-008).
(2) Stop the APU (Ref. AMM TASK 49-00-00-860-009).
(3) Add oil to correct level (Ref. AMM TASK 49-90-00-600-007).
(4) Examine the tube connections for leaks. No leaks are permitted.

5. Close-up
Subtask 49-91-44-410-060-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the LIGHT control SW 11LJ to the OFF position.
(3) Close the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-91-44-860-069-A ** ON A/C NOT FOR ALL

B. 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 ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:33:31 UTC