Installation of the Oil Heater (131-9(A))

TASK 49-96-51-400-002-A
Installation of the Oil Heater (131-9(A))

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	AR	ACCESS PLATFORM 5M (16 FT)- ADJUSTABLE
No specific	AR	WARNING NOTICE(S)
No specific	Torque wrench: range to between 55 and 45 lbf.in (0.62 and 0.51 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. -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
5	O-RING	AIPC 49-96-09-01-020

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 49-00-00-710-010-A	Operational Test of the APU
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (131-9(A))
TASK 52-41-00-410-001-A	Close the APU Doors after Access
Oil Heater

3. Job Set-up
Subtask 49-96-51-860-053-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) Make sure that the APU MASTER SW p/bsw on the panel 25VU is OFF.
(3) Make sure that the WARNING NOTICE(S) is in position on the panel 25VU 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 5M (16 FT)- ADJUSTABLE is in position below the APU access door 316AR.
(6) Make sure that the access doors 315AL, 316AR are open.
(7) Make sure that the LIGHT SW 11LJ is set to the ON position.

Subtask 49-96-51-865-057-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
** ON A/C NOT FOR ALL
121VU	APU/OIL/HTR/SPLY	1KT	K41

4. Procedure
Subtask 49-96-51-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Oil Heater
(1) Remove the blanking plug from the gearbox.
(2) Clean the component interfaces and the adjacent area.
(3) Do an inspection of the component interfaces and the adjacent area.
(4) Lubricate the new AIPC 49-96-09-01-020 O-RING (5) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) .
(5) Install the new O-ring (5) on the heater (3).
(6) Put the heater (3) in position in the gearbox.
(7) Install the washers (2) and the bolts (1).
(8) TORQUE the bolts (1) to between 55 and 45 lbf.in (0.62 and 0.51 m.daN )

.
(9) Remove the blanking caps from the electrical connectors.
(10) Connect the electrical connector (4) to the heater (3).
(11) Refill the gearbox with oil (Ref. AMM TASK 49-90-00-600-007).
(12) Make sure that the work area is clean and clear of tools and other items.

Subtask 49-96-51-865-058-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
** ON A/C NOT FOR ALL
121VU	APU/OIL/HTR/SPLY	1KT	K41

Subtask 49-96-51-790-051-A ** ON A/C NOT FOR ALL

C. Test
(1) Operate the APU for 5 minutes (Ref. AMM TASK 49-00-00-710-010).
(2) Examine the heater (3) for leaks.

NOTE: Leaks are not permitted.

5. Close-up
Subtask 49-96-51-410-053-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 SW 11LJ to the OFF position.
(3) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-96-51-860-054-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 12:43:33 UTC