DOC AIRBUS | AMM A320FAPU Compressor Cleaning (131-9(A))
TASK 49-20-00-100-808-A
APU Compressor Cleaning (131-9(A))
APU Load Compressor cleaning as a result of fluid ingestion from Aircraft/APU leaks that goes into the APU inlet.
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 49-20-00-860-120-A ** ON A/C NOT FOR ALL
Subtask 49-20-00-020-061-A ** ON A/C NOT FOR ALL
Subtask 49-20-00-410-085-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:28:46 UTC
APU Compressor Cleaning (131-9(A))
WARNING:
WAIT A MINIMUM OF 1 HOUR AFTER THE APU SHUTDOWN TO LET THE INTERNAL TEMPERATURE DECREASE TO BETWEEN 55 AND 60 DEG. THERE IS A RISK OF BURNS IF YOU APPLY CLEANING FLUID WHEN THE APU IS TOO HOT.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
1. Reason for the JobAPU Load Compressor cleaning as a result of fluid ingestion from Aircraft/APU leaks that goes into the APU inlet.
NOTE: This procedure will not correct all APU problems. All fluid leaks must be corrected before the cleaning procedure.
Complete this task after contamination of the engine with: - fuel,
- corrosive materials,
- oils.
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE |
| No specific | AR | CAP - BLANKING |
| No specific | AR | CLEANING EQUIPMENT - COMPRESSOR |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | PUMP - HAND |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | Torque wrench: range to between 0.616 and 0.504 m.daN (54.51 and 44.60 lbf.in )  | |
| 98A49007625001 | 1 | DEVICE - CLEANING, APU |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.08ABC1) | Aqueous Cleaner-Aircraft Exterior Pressure Spraying - |
| (Material No.08AJA9) | Aqueous Cleaner-Turbine Engine Gas Path - Legacy |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 315AL, 316AR |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-00-00-615-803-A | Level B Decontamination of the Environmental Control System (ECS) |
| TASK 21-00-00-615-804-A | Level C Decontamination of the Environmental Control System (ECS) |
| TASK 23-44-00-860-001-A | Operation of the Service Interphone System |
| 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 49-51-51-000-004-A | Removal of the Load Control Valve (131-9(A)) |
| TASK 49-51-51-400-004-A | Installation of the Load Control Valve (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 |
Bleed Air Duct - APUSubtask 49-20-00-860-120-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 hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(3) Connect the service interphone to the aircraft (Ref. AMM TASK 23-44-00-860-001).
Subtask 49-20-00-865-116-A ** ON A/C NOT FOR ALL (1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(3) Connect the service interphone to the aircraft (Ref. AMM TASK 23-44-00-860-001).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 49-20-00-010-084-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
C. Get Access
(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU 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. Procedure(1) Put an ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU 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.
Subtask 49-20-00-020-061-A ** ON A/C NOT FOR ALL
A. Disconnect the Bleed Air Duct
(1) Remove the clamp (2).
(2) Install the PLUG - BLANKING on the bleed air duct (3).
(4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
Subtask 49-20-00-100-068-A ** ON A/C NOT FOR ALL (1) Remove the clamp (2).
(2) Install the PLUG - BLANKING on the bleed air duct (3).
NOTE: Do not cover the flange of the APU load control valve (1).
(3) Disconnect the electrical connector P12 from the load control valve. (4) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
B. Preparation and Cleaning
(1) Install the 98A49007625001 DEVICE - CLEANING, APU to the APU with the mount assembly.
(a) Install the mounting plate (14) on the APU rear lower mount boss with the knurled screw (15).
(b) Attach the tube support assembly (16) to the mount plate (14) with the knurled screws (17).
(c) Attach the sprayer unit (23) to the support assembly (16) with the clamp plate (22). Install the screws (18), washers (19) and (21) and nuts (20).
(2) Adjust spray nozzles to spray the load compressor.
(a) Mix 12.0 l (3.1700 USgal) of the de-mineralized water and 6.0 l (1.5850 USgal) of Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to make the cleaner solution.
(b) Fill the container of the CLEANING EQUIPMENT - COMPRESSOR with 9.0 l (2.3775 USgal) of the cleaner solution.
(c) Close the container and make sure that it is correctly sealed.
(d) Operate the handpump on the compressor cleaning device and pressurize the container to 5 bar (72.5189 psi).
(8) Make sure that the pressure is released from the compressor cleaning device before the container is opened.
(9) Fill the compressor-cleaning device container with 9.0 l (2.3775 USgal) of the cleaner solution.
(10) Close the container and make sure that it is correctly sealed.
(11) Operate the handpump on the compressor cleaning device and pressurize the container to 5 bar (72.5189 psi).
(12) Spray the cleaner fluid only into the APU compressor for a second time until the cleaning device is empty.
(14) Stop the APU (Ref. AMM TASK 49-00-00-860-009).
(15) Remove the 98A49007625001 DEVICE - CLEANING, APU.
(a) Remove the knurled screws (17) and remove the cleaning device.
(b) Remove the knurled screw (15) and the mount plate (14) from the rear lower mount boss.
(16) Make sure that there is no contamination (or residue from the cleaner solution) on the load control-valve inlet or the load compressor-discharge duct.
(a) Remove the load control valve (Ref. AMM TASK 49-51-51-000-004).
(b) If necessary, manually clean and remove the contamination with Textile-Lint free Cotton - (Material No.14SBA1) and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(c) Install the load control valve (Ref. AMM TASK 49-51-51-400-004).
Subtask 49-20-00-420-057-A ** ON A/C NOT FOR ALL (1) Install the 98A49007625001 DEVICE - CLEANING, APU to the APU with the mount assembly.
(a) Install the mounting plate (14) on the APU rear lower mount boss with the knurled screw (15).
(b) Attach the tube support assembly (16) to the mount plate (14) with the knurled screws (17).
(c) Attach the sprayer unit (23) to the support assembly (16) with the clamp plate (22). Install the screws (18), washers (19) and (21) and nuts (20).
(2) Adjust spray nozzles to spray the load compressor.
NOTE: The APU power compressor must not be cleaned.
(3) Make sure that the spray nozzle assembly is correctly installed and tightened. WARNING:
WHEN YOU USE COMPRESSED AIR:
(4) Prepare 18.0 l (4.7551 USgal) of the compressor wash-cleaner solution. - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
(a) Mix 12.0 l (3.1700 USgal) of the de-mineralized water and 6.0 l (1.5850 USgal) of Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to make the cleaner solution.
(b) Fill the container of the CLEANING EQUIPMENT - COMPRESSOR with 9.0 l (2.3775 USgal) of the cleaner solution.
(c) Close the container and make sure that it is correctly sealed.
(d) Operate the handpump on the compressor cleaning device and pressurize the container to 5 bar (72.5189 psi).
CAUTION:
MAKE SURE THAT YOU HAVE THE CORRECT FIRE FIGHTING EQUIPMENT AVAILABLE.
THE APU FIRE EXTINGUISHING SYSTEM IS NOT SUFFICIENT TO EXTINGUISH A FIRE IF THE ACCESS DOORS 315AL AND 316AR ARE OPEN/ REMOVED.
KEEP OPERATION OF THE APU TO A MINIMUM WHEN THE ACCESS DOORS ARE OPEN/REMOVED.
(5) Start and operate the APU (Ref. AMM TASK 49-00-00-860-008). NOTE: APU run with open doors:
(6) Spray the cleaner fluid only into the APU load compressor until the compressor cleaning device is empty. - make sure that the access platform can not move.
- make sure that the fire fighting equipment and the necessary persons to monitor the start and operation of the APU are available.
- make sure that no persons or loose equipment are in the danger areas.
- make sure that persons are not in the APU compartment or on the access platform below the APU during start, mode change (MES on/off, de-ice on/off, ECS demand change, APU Gen. on/off) and/or shutdown.
NOTE: Keep the pressure in the compressor cleaning device to approximately 5 bar (72.5189 psi). Use a PUMP - HAND to do this.
(7) Operate the APU for 2 minutes with no cleaner fluid in the APU compressor.(8) Make sure that the pressure is released from the compressor cleaning device before the container is opened.
(9) Fill the compressor-cleaning device container with 9.0 l (2.3775 USgal) of the cleaner solution.
(10) Close the container and make sure that it is correctly sealed.
(11) Operate the handpump on the compressor cleaning device and pressurize the container to 5 bar (72.5189 psi).
(12) Spray the cleaner fluid only into the APU compressor for a second time until the cleaning device is empty.
NOTE: Keep the pressure in the compressor cleaning device to approximately 5 bar (72.5189 psi). Use a PUMP - HAND to do this.
(13) Operate the APU for 10 minutes more to make sure that the bleed components are dry.(14) Stop the APU (Ref. AMM TASK 49-00-00-860-009).
(15) Remove the 98A49007625001 DEVICE - CLEANING, APU.
(a) Remove the knurled screws (17) and remove the cleaning device.
(b) Remove the knurled screw (15) and the mount plate (14) from the rear lower mount boss.
(16) Make sure that there is no contamination (or residue from the cleaner solution) on the load control-valve inlet or the load compressor-discharge duct.
(a) Remove the load control valve (Ref. AMM TASK 49-51-51-000-004).
(b) If necessary, manually clean and remove the contamination with Textile-Lint free Cotton - (Material No.14SBA1) and Aqueous Cleaner-Aircraft Exterior Pressure Spraying - (Material No.08ABC1) .
(c) Install the load control valve (Ref. AMM TASK 49-51-51-400-004).
C. Connection of the Bleed air Duct
(1) Remove the blanking plug from the bleed air duct (3).
(2) Make sure that the bleed air duct (3) is clean and dry.
(a) If necessary, clean the bleed air duct (3) (Ref. AMM TASK 21-00-00-615-803) or (Ref. AMM TASK 21-00-00-615-804).
(3) Connect the bleed air duct (3) to the load control valve (1) with the clamp (2).
.
(5) Remove the blanking caps and connect the electrical connector P12 to the load control valve.
5. Close-up(1) Remove the blanking plug from the bleed air duct (3).
(2) Make sure that the bleed air duct (3) is clean and dry.
(a) If necessary, clean the bleed air duct (3) (Ref. AMM TASK 21-00-00-615-803) or (Ref. AMM TASK 21-00-00-615-804).
(3) Connect the bleed air duct (3) to the load control valve (1) with the clamp (2).
CAUTION:
DO NOT TORQUE THE V-CLAMP(S) TO MORE THAN THE SPECIFIED VALUE. THIS CAN CAUSE DAMAGE TO THE FLANGE SURFACES.
(4) TORQUE the clamp (2) to between 0.616 and 0.504 m.daN (54.51 and 44.60 lbf.in ) . (5) Remove the blanking caps and connect the electrical connector P12 to the load control valve.
Subtask 49-20-00-410-085-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 switch 11LJ to the OFF position.
(3) Close the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).
Subtask 49-20-00-865-117-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the light switch 11LJ to the OFF position.
(3) Close the APU access doors 315AL and 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 49-20-00-860-121-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 121VU | APU/APU/CTL | 2KD | L42 |
| 121VU | APU/ECB/SPLY | 1KD | L41 |
C. 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).
(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).