Brand/Type Oil Change (Flush Procedure) (131-(A))

TASK 49-90-00-600-008-A-02
Brand/Type Oil Change (Flush Procedure) (131-(A))

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.

CAUTION: USE ONLY APPROVED TYPES/BRANDS OF LUBRICANTS.

1. Reason for the Job
Brand/Type Oil Change.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	1	ACCESS PLATFORM 4M (13 FT)
No specific	2	CONTAINER 10 L(2 1/2 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER
No specific	1	WARNING NOTICE(S)

B. Consumable Materials

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

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Referenced Information

REFERENCE	DESIGNATION
TASK 12-32-49-281-001-A	Oil Sampling for Analysis
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 24-42-00-862-001-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 49-91-41-200-002-A	Remove and Discard Oil Filter Elements (131-9(A))
TASK 49-91-42-000-003-A	Removal of the Drain Plug (131-9(A))
TASK 49-91-42-400-003-A	Installation of the Drain Plug (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
Oil Servicing
Guideline for the Oil Consumption of the APU 131-9(A) in Service

3. Job Set-up
Subtask 49-90-00-860-073-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits
(Ref. AMM TASK 24-41-00-861-002).
(2) On the panel 25VU, make sure that the APU MASTER SW p/bsw is OFF.
(3) Put a WARNING NOTICE(S) 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 49-90-00-865-074-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 49-90-00-010-062-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT) below the APU access doors 315AL and 316AR.
(2) Open the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT control SW 11LJ to the ON position.

4. Procedure

WARNING: USE THE CORRECT PERSONAL PROTECTION. OIL CAN HAVE ADDITIVE CALLED TRICRESYL PHOSPHATE IN IT. THIS CHEMICAL IS AN ASPHYXIANT, IT IS POISONOUS AND CAN BE ABSORBED THROUGH THE SKIN. USE CARE WHEN ENGINE OIL IS DRAINED. HOT OIL CAN POSSIBLY CAUSE BAD BURNS.

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

Subtask 49-90-00-612-065-A ** ON A/C NOT FOR ALL

A. Brand/Type Oil Change

NOTE: Do the Oil level inspection check and servicing a minimum of 15 minutes after the last shutdown. Do not re-service before the APU is operated again.

(1) Position the CONTAINER 10 L(2 1/2 USGAL) below the drain plug.
(2) Open the filler cap to release the APU and let the oil to drain.
(3) Remove the drain plug and drain the oil into the container (Ref. AMM TASK 49-91-42-000-003).

NOTE: If you think that the condition of the drained oil is not correct, do a sampling of the APU oil for analysis (Ref. AMM TASK 12-32-49-281-001).

(4) Install the drain plug (Ref. AMM TASK 49-91-42-400-003).
(5) Remove the oil filler cap and fill with selected new specification/brand or type of oil.
(6) Close and lock the oil filler cap and motor engine for 30 seconds to fill oil pump if necessary.
(7) Remove the remaining oil from the gravity oil filler and dry it with a Textile-Lint free Cotton - (Material No.14SBA1) .
(8) If you fill the APU oil reservoir with an oil which is of a new brand or type:
(a) Replace the oil placard to show the new oil type or brand correctly.
(b) Make an entry in the logbook that the APU oil reservoir is filled with a new oil type or brand.
(9) Remove the CONTAINER 10 L(2 1/2 USGAL).
(10) If a brand new oil pump is installed:
(a) Disconnect the ignition exciter unit.
(b) Push the APU MASTER SW pushbutton switch (the ON legend comes ON).
(c) Push the APU START pushbutton switch (the ON legend comes ON).

NOTE: The APU must start rotating without ignition for 30 seconds.

NOTE: This procedure is not necessary if the oil pump remains the same.

Subtask 49-90-00-860-074-A ** ON A/C NOT FOR ALL

B. Start and Operate the APU
(1) Close the APU access doors 315AL, 316AR (Ref. AMM TASK 52-41-00-410-001).
(2) Start the APU (Ref. AMM TASK 49-00-00-860-008).
(3) Let the APU run 10 minutes.
(4) Stop the APU (Ref. AMM TASK 49-00-00-860-009).
(5) Open the APU access doors 315AL, 316AR (Ref. AMM TASK 52-41-00-010-001).

Subtask 49-90-00-960-051-A ** ON A/C NOT FOR ALL

C. Replacement of the Oil Filters

NOTE: Do the Oil level inspection check and servicing a minimum of 15 minutes after the last shutdown. Do not re-service before the APU is operated again.

NOTE: If you think that the condition of the drained oil is not correct, do a sampling of the APU oil for analysis (Ref. AMM TASK 12-32-49-281-001).

(4) Remove and discard the filter elements from the lube module (Ref. AMM TASK 49-91-41-200-002).
(5) Install the drain plug (Ref. AMM TASK 49-91-42-400-003).
(6) Remove the oil filler cap and fill with selected new specification/brand or type of oil.
(7) Install the oil filler cap and motor engine for 30 seconds to fill oil pump if necessary.
(8) Remove the CONTAINER 10 L(2 1/2 USGAL).

5. Close-up
Subtask 49-90-00-410-069-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).

Subtask 49-90-00-865-075-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 49-90-00-790-057-A ** ON A/C NOT FOR ALL

C. Test
(1) Operate the APU for five minutes (Ref. AMM TASK 49-00-00-860-008) and (Ref. AMM TASK 49-00-00-860-009).
(2) Open the access door 315AL.
(3) Examine the drain plug and oil filters for leaks.

NOTE: No leaks are permitted.

Subtask 49-90-00-410-070-A ** ON A/C NOT FOR ALL

D. 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 door 315AL (Ref. AMM TASK 52-41-00-410-001).

Subtask 49-90-00-860-075-A ** ON A/C NOT FOR ALL

E. 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 access platform(s).
(4) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:32:56 UTC