Installation of the Oil Cooler (APS 3200)

TASK 49-91-44-400-003-A
Installation 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: 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	Torque wrench: range to between 21.0 and 15.0 lbf.in (0.24 and 0.17 m.daN )
No specific	Torque wrench: range to 18 lbf.in (0.20 m.daN )
No specific	Torque wrench: range to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )
No specific	Torque wrench: range to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )
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 56.0 and 51.0 lbf.in (0.63 and 0.58 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.14QFC1)	Wire-Locking Dia: 0.8 mm CRES -

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
15	PACKING	AIPC 49-21-04-51-210
15	PACKING	AIPC 49-21-84-20-140
3	PACKING	AIPC 49-21-84-20-140
12	PACKING	AIPC 49-91-44-50-020
12	PACKING	AIPC 49-91-84-26-020

E. 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 24-41-00-862-002-A	De-energize the Aircraft Electrical Circuits Supplied from the External Power
TASK 24-41-00-862-002-A-01	De-energize the Aircraft Electrical Circuits Supplied from the APU
TASK 24-41-00-862-002-A-02	De-energize the Aircraft Electrical Circuits Supplied from the Engine 1(2)
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 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

3. Job Set-up
Subtask 49-91-44-860-051-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized (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) Make sure that there is 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).
(5) Make sure that the access platform is in position below the APU compartment.
(6) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(7) Make sure that the LIGHT control switch 11LJ is set to the on position.

Subtask 49-91-44-865-064-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

4. Procedure
Subtask 49-91-44-420-052-B ** ON A/C NOT FOR ALL

A. Installation of the Oil Cooler
(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 (14) 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 (5) if you find defects.
(5) Remove the protective covers from the cooling fan outlet duct (16) and the new oil cooler (5).
(6) Position the band clamp (4) on cooling fan outlet duct (16).
(7) Position the oil cooler (5) on the mount brackets with the top flange located in the cooling fan outlet duct (16). Loosely install the four mount bolts (6).

NOTE: Do not tighten the bolts (6) at this time.

(8) Position the band clamp (7) on the oil cooler outlet duct (8).
(9) Locate the oil cooler outlet duct (8) and band clamp (7) on the oil cooler lower flange.

NOTE: Do not tighten the band clamps (4) and (7) at this time.

(10) TORQUE the mount bolts (6) to between 56.0 and 51.0 lbf.in (0.63 and 0.58 m.daN )

.
(11) Remove the blanking caps from the tubes (2) and (14).
(12) Apply Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) on the new AIPC 49-21-04-50-140 PACKING (3) or AIPC 49-21-84-20-140 PACKING (3) and AIPC 49-21-04-51-210 PACKING (15) or AIPC 49-21-84-20-140 PACKING (15).
(13) Put the new packings (3) and (15) on the tubes (2) and (14).
(14) Insert the oil tube (2) into the oil cooler and attach the packing (3) to the tube mount boss studs with the two nuts (1).
(15) TORQUE the two nuts (1) to between 53 and 48 lbf.in (0.60 and 0.54 m.daN )

.
(16) Insert the oil tube (14) into the oil cooler and attach the packing (15) to the tube mount boss studs with the two nuts (13).
(17) TORQUE the two nuts (13) to between 53 and 48 lbf.in (0.60 and 0.54 m.daN )

.
(18) TORQUE the band clamp nuts (4) to 18 lbf.in (0.20 m.daN )

.
(19) TORQUE the band clamp nuts (7) to between 21.0 and 15.0 lbf.in (0.24 and 0.17 m.daN )

.
(20) Attach the oil cooler outlet duct (8) to the exhaust duct (10) with the V-band clamp (9).
(21) TORQUE the V-band clamp nut (9) to between 45 and 35 lbf.in (0.51 and 0.40 m.daN )

.
(22) Put the new AIPC 49-91-44-50-020 PACKING (12) or AIPC 49-91-84-26-020 PACKING (12) on the drain plug (11).
(23) Install the drain plug (11) on the oil cooler (5).
(24) TORQUE the drain plug (11) to between 30 and 25 lbf.in (0.34 and 0.28 m.daN )

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.

(25) Safety the drain plug (11) with 14QFC1Wire-Locking Dia: 0.8 mm CRES -.

Subtask 49-91-44-865-065-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 49-91-44-710-053-C ** ON A/C NOT FOR ALL

C. Test for Leaks
(1) Start the APU (Ref. AMM TASK 49-00-00-860-005).
(2) Stop the APU (Ref. AMM TASK 49-00-00-860-006).
(3) Make sure that the oil level of the APU is correct (Ref. AMM TASK 49-90-00-600-004).
(4) Open APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(5) Examine the fan outlet duct (16), the oil cooler (5), the outlet duct (8) and the check valve connections for oil leaks.

NOTE: No leaks are permitted.

(6) Examine the oil tubes (14) and (2) for oil leaks.

NOTE: No leaks are permitted.

5. Close-up
Subtask 49-91-44-410-055-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) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(3) Remove the access platform(s).

Subtask 49-91-44-860-052-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 aircraft electrical circuits
(Ref. AMM TASK 24-41-00-862-002).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:33:28 UTC