Installation of the Oil-Cooler Transfer Tubes (APS3200)

TASK 49-91-44-400-803-A
Installation 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: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

CAUTION: DO NOT APPLY MORE THAN THE SPECIFIED TORQUE. IF YOU DO, YOU CAN CAUSE DAMAGE TO THE TUBES.

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 53 and 48 lbf.in (0.60 and 0.54 m.daN )
No specific	Torque wrench: range to between 56 and 51 lbf.in (0.63 and 0.58 m.daN )
No specific	Torque wrench: range to between 200 and 150 lbf.in (2.26 and 1.70 m.daN )
No specific	Torque wrench: range to between 950 and 850 lbf.in (10.74 and 9.61 m.daN )

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. -
(Material No.14SBA1)	Textile-Lint free Cotton -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	PACKING	AIPC 49-21-04-50-140
10	PACKING	AIPC 49-21-04-50-170
7	PACKING	AIPC 49-21-04-51-210
3	PACKING	AIPC 49-21-84-20-140
7	PACKING	AIPC 49-21-84-20-140
10	PACKING	AIPC 49-21-84-20-170

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 49-00-00-860-005-A	APU Start by External Power
TASK 49-00-00-860-005-A-01	APU Start by Batteries
TASK 49-00-00-860-006-A	APU Shutdown by External Power
TASK 49-00-00-860-006-A-01	APU Shutdown by Batteries
TASK 49-90-00-600-004-A	Check Oil Level and Replenish (APS 3200)
TASK 49-91-44-000-003-A	Removal of the Oil Cooler (APS 3200)
TASK 49-91-44-400-003-A	Installation of the Oil Cooler (APS 3200)
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 (APS3200)

3. Job Set-up
Subtask 49-91-44-860-074-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the ground service network is energized
(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 49-91-44-865-083-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 49-91-44-010-066-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 49-91-44-420-057-B ** ON A/C NOT FOR ALL

A. Installation of the Oil-Cooler Transfer Tubes

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.

(1) Make sure that the parts retained from the removed component are clean and in the correct condition.
(2) Do an inspection of the component interfaces and the adjacent area.
(3) Do a visual inspection of the tubes (2) and (5) for evidence of aluminum deposits, rough surfaces or deformation. Replace the tube(s) if you find defects.
(4) Do a visual inspection of the threads on the tube mount boss studs for, chipping, galling or deformation. Replace the oil cooler (4) (Ref. AMM TASK 49-91-44-000-003) and (Ref. AMM TASK 49-91-44-400-003) if you find defects.
(5) Remove the PLUG-BLANKING from each disconnected line end.
(6) 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 49-21-04-50-170 PACKING (10) or AIPC 49-21-84-20-170 PACKING (10).
(7) Install the new packing (10) on the union (9).
(8) Install the union (9) in the tube nut (8).
(9) TORQUE the union (9) to between 200 and 150 lbf.in (2.26 and 1.70 m.daN )

.
(10) Connect the tube (2).
(11) Hold the union (9) with a wrench while you torque the tube nut (8) to prevent torque transfer.
(12) TORQUE the tube nut (8) to between 950 and 850 lbf.in (10.74 and 9.61 m.daN )

.
(13) 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 49-21-04-50-140 PACKING (3) or AIPC 49-21-84-20-140 PACKING (3).
(14) Put the new packing (3) on the tube (2).
(15) Insert the tube (2) into the oil cooler (4) and attach the packing (3) to the tube mount boss studs with the two nuts (1).
(16) TORQUE the two nuts (1) to between 53 and 48 lbf.in (0.60 and 0.54 m.daN )

.
(17) 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 49-21-04-51-210 PACKING (7) or AIPC 49-21-84-20-140 PACKING (7).
(18) Put the new packing (7) on the tube (5).
(19) Insert the tube (5) into the oil cooler (4) and attach the packing (7) to the tube mount boss studs with the two nuts (6).
(20) TORQUE the two nuts (6) to between 53 and 48 lbf.in (0.60 and 0.54 m.daN )

.
(21) Connect the tube nut (11) to the union.
(22) Hold the union with a wrench while you torque the tube nut (11) to prevent torque transfer.
(23) TORQUE the tube nut (11) to between 950 and 850 lbf.in (10.74 and 9.61 m.daN )

.
(24) Install the clamp (14) with the bolt (12) and the nut (13).
(25) TORQUE the bolt (12) to between 56 and 51 lbf.in (0.63 and 0.58 m.daN )

.
(26) Clean the surfaces with a dry and clean Textile-Lint free Cotton - (Material No.14SBA1) to remove the dirt found.

Subtask 49-91-44-865-084-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 49-91-44-710-056-B ** ON A/C NOT FOR ALL

C. Test for Leaks
(1) Start the APU (Ref. AMM TASK 49-00-00-860-005).
(2) Let the APU operate for five minutes.
(3) Stop the APU (Ref. AMM TASK 49-00-00-860-006).
(4) Make sure that the oil level of the APU is correct (Ref. AMM TASK 49-90-00-600-004).
(5) Open APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(6) Oil Cooler with nut connection:
(a) Examine the tubes (2) and (5) for oil leaks.

NOTE: No leaks are permitted.

5. Close-up
Subtask 49-91-44-410-062-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 49-91-44-860-075-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 01:33:25 UTC