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

TASK 49-91-42-000-003-A
Removal of the Drain Plug (131-9(A))

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

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	ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE
No specific	AR	CONTAINER 1 L (1/4 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	AR	WARNING NOTICE(S)

B. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
136AR, 315AL

C. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-90-00-600-008-A	Oil Change (Drain Procedure) (131-9(A))
TASK 49-90-00-600-008-A-01	Oil Change (Top-Off Procedure) (131-9(A))
TASK 49-90-00-600-008-A-02	Brand/Type Oil Change (Flush Procedure) (131-(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
Magnetic Drain Plug (131-9(A))

3. Job Set-up
Subtask 49-91-42-860-058-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) Put 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 49-91-42-865-063-A ** ON A/C NOT FOR ALL

B. Open, safety and tag 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 49-91-42-010-054-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU compartment.
(2) Open the APU access doors 315AL 136AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT SW 11LJ to the ON position.

4. Procedure
Subtask 49-91-42-020-054-A ** ON A/C NOT FOR ALL

A. Removal of the Drain Plug
(1) Put the CONTAINER 1 L (1/4 USGAL) to the position below the drain plug (3).
(2) Push the metal chip detector (1) and turn it to remove from the gearbox.
(3) Remove and discard the two packings (2) from the metal chip detector (1).
(4) Push the drain plug (3) and turn it to remove from the gearbox.
(5) Remove and discard the O-ring (4) from the drain plug (3).
(6) Drain the APU oil (Ref. AMM TASK 49-90-00-600-008) into the CONTAINER 1 L (1/4 USGAL).

[Rev.10 from 2021] 2026.04.01 12:41:58 UTC