Cleaning of the APU Compartment with installed APU (APS 3200)

TASK 49-00-00-100-002-A
Cleaning of the APU Compartment with installed APU (APS 3200)

WARNING: BEFORE YOU START WORK, YOU MUST PUT ON A SAFETY HARNESS AND ATTACH IT TO THE ACCESS PLATFORM. WITHOUT A SAFETY HARNESS, YOU CAN FALL. THIS CAN KILL YOU OR CAUSE YOU INJURY.

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.

ZONE: 315
ZONE: 316
FIN: 4005KM ** ON A/C NOT FOR ALL

1. Reason for the Job
Troubleshooting if de-icing contamination is found
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	1	CLEANING EQUIPMENT - STEAM
No specific	AR	CONTAINER 5 L (1.32 USGAL)
No specific	AR	SAFETY CLIP - CIRCUIT BREAKER

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.08ABD1)	Aqueous Cleaner-Aircraft Exterior Gel Type -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315	TAIL CONE APU AND ACCESSORY COMPARTMENT
316	TAIL CONE APU AND ACCESSORY COMPARTMENT
315AL, 316AR

D. 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 49-00-00-710-008-A	Operational Test of the APU
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
TASK 52-41-21-000-001-A	Removal of APU Access Door 315AL
TASK 52-41-21-400-001-A	Installation of APU Access Door 315AL
TASK 52-41-22-000-001-A	Removal of the APU Access Door and the related Door Mechanism
TASK 52-41-22-400-001-A	Installation of the APU Access Door and the related Door Mechanism

3. Job Set-up
Subtask 49-00-00-860-111-A ** ON A/C NOT FOR ALL

A. Aircraft Maintenance Configuration
(1) Put the warning notices on panel 25VU to tell persons not to start the APU.
(2) Energize the ground service network (Ref. AMM TASK 24-41-00-861-002).
(3) Make sure that the hydraulic systems are depressurized (Ref. AMM TASK 29-00-00-864-001).

Subtask 49-00-00-865-122-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/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

Subtask 49-00-00-010-075-A ** ON A/C NOT FOR ALL

C. Get Access
(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the access doors 315AL and 316AR.
(2) Open the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-010-001).
(3) Set the light switch 11LJ to the ON position.
(4) Remove the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-21-000-001) (Ref. AMM TASK 52-41-22-000-001).

4. Procedure

CAUTION: DO NOT POINT THE SPRAY INTO THE APU INTAKE-DUCT. WATER CAN GO INTO THE FELT METAL AND FREEZE. THIS WILL CAUSE DAMAGE TO THE INTAKE DUCT AND MAKE IT UNSERVICEABLE.

Subtask 49-00-00-160-051-A ** ON A/C NOT FOR ALL

A. Cleaning of the APU Compartment
(1) Take a CONTAINER 5 L (1.32 USGAL) and use a solution of 50% water and 50% Aqueous Cleaner-Aircraft Exterior Gel Type - (Material No.08ABD1) .
(2) Apply the solution with a sponge on the APU compartment walls.
(3) Leave the solution on the surface for 20 minutes.
(4) Rinse the surface with warm clear water.

Subtask 49-00-00-160-054-A ** ON A/C NOT FOR ALL

B. Cleaning Alternative for the APU Compartment
(1) Spray the solution (50 percent of water and 50 percent of the Aqueous Cleaner-Aircraft Exterior Gel Type - (Material No.08ABD1) ) at a low pressure on the compartment wall.
(a) Make sure that you do not spray the solution on the APU.
(2) Let the solution stay on the surface for 20 minutes.
(3) Flush the surface with the CLEANING EQUIPMENT - STEAM (at a temperature of 70 deg.C (158.00 deg.F)) and at the lowest pressure.

Subtask 49-00-00-865-228-A ** ON A/C NOT FOR ALL

C. 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/FIRE AND OVHT/DET/LOOP B	2WG	L44
121VU	APU/FIRE AND OVHT/DET/LOOP A	1WG	L43
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41
121VU	APU/FIRE/EXTIG/SQUIB/B	2WF	L39
121VU	APU/FIRE/EXTIG/SQUIB/A	1WF	L38
121VU	APU/FIRE/LP VALVE/NORM	4WF	M42
121VU	APU/FIRE/LP VALVE/STBY	3WF	M41

Subtask 49-00-00-710-069-A ** ON A/C NOT FOR ALL

D. Operational Test
(1) Start and operate the APU (Ref. AMM TASK 49-00-00-710-008) for 10 minutes.

5. Close-up
Subtask 49-00-00-410-079-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) Install the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-21-400-001) (Ref. AMM TASK 52-41-22-400-001).
(3) Set the light switch 11LJ to the OFF position.
(4) Close the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(5) Remove the access platform(s).

Subtask 49-00-00-860-114-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration.
(1) De-energize the ground service network (Ref. AMM TASK 24-41-00-862-002)
(2) Remove the WARNING NOTICE(S).
(3) Remove the ground support and maintenance equipment, the special and standard tools and all other items.

[Rev.10 from 2021] 2026.04.01 01:26:18 UTC