Installation of the Drain Plug (131-9(A))

TASK 49-91-42-400-003-A
Installation of the Drain Plug (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	Torque wrench: range to between 88 and 72 lbf.in (0.99 and 0.81 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
136AR, 315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
4	O-RING	AIPC 49-91-09-02-090
2	PACKINGS	AIPC 49-91-42-70-010
4	O-RING	AIPC 49-91-84-30-120
2	PACKINGS	AIPC 49-91-84-33-010

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
Magnetic Drain Plug (131-9(A))

3. Job Set-up
Subtask 49-91-42-860-059-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) 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).

Subtask 49-91-42-865-064-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

Subtask 49-91-42-010-056-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) Set the LIGHT SW 11LJ to the ON position.

4. Procedure
Subtask 49-91-42-420-054-A ** ON A/C NOT FOR ALL

A. Installation of the Drain Plug
(1) Lubricate the new AIPC 49-91-09-02-090 O-RING (4) or AIPC 49-91-84-30-120 O-RING (4) with Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) .
(2) Install the new O-ring (4) on the drain plug (3).
(3) TORQUE the drain plug (3) to between 88 and 72 lbf.in (0.99 and 0.81 m.daN )

.
(4) Install the metal chip detector (1) with the new two AIPC 49-91-42-70-010 PACKINGS (2) or AIPC 49-91-84-33-010 PACKINGS (2).
(5) Do the servicing of the oil system (Ref. AMM TASK 49-90-00-600-007)

Subtask 49-91-42-865-065-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 49-91-42-710-052-A ** ON A/C NOT FOR ALL

C. Start and Operate the APU.
(1) Close the APU access doors (Ref. AMM TASK 52-41-00-410-001).
(2) Start the APU (Ref. AMM TASK 49-00-00-860-008).
(3) Allow the APU to run for 5 minutes.
(4) Shutdown the APU (Ref. AMM TASK 49-00-00-860-009).
(5) Open the APU access doors 315AL 136AR (Ref. AMM TASK 52-41-00-010-001).
(6) Check the drain plug for leaks.

NOTE: Leaks are not permitted.

5. Close-up
Subtask 49-91-42-410-055-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) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Set the LIGHT SW 11LJ to the OFF position.
(4) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(5) Remove the access platform(s).

Subtask 49-91-42-860-061-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 01:33:19 UTC