DOC AIRBUS | AMM A320FCleaning of the APU Engine and the APU Access Doors (131-9(A))
TASK 49-00-00-100-807-A
Cleaning of the APU Engine and the APU Access Doors (131-9(A))
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Referenced Information
3. Job Set-up
Subtask 49-00-00-860-220-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-100-050-A ** ON A/C NOT FOR ALL
Subtask 49-00-00-410-105-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:26:22 UTC
Cleaning of the APU Engine and the APU Access Doors (131-9(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.
1. Reason for the JobSelf 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 | 1 | BLOWING EQUIPMENT - DRY AIR |
| No specific | AR | CAP - BLANKING |
| No specific | 1 | CLEANING EQUIPMENT - STEAM |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.08AJA1) | Aqueous Cleaner-Turbine Engine Gas Path - - |
| (Material No.14SBA1) | Textile-Lint free Cotton - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 315AL, 316AR |
| REFERENCE | DESIGNATION |
|---|---|
| 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 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 |
Subtask 49-00-00-860-220-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 49-00-00-865-214-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 49-00-00-010-111-A ** ON A/C NOT FOR ALL | 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 |
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 49-00-00-100-050-A ** ON A/C NOT FOR ALL
A. External Cleaning of the APU
(a) If you remove a component, identify the area.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Prepare the cleaning solution as follows:
1 Maximum mix ratio: 1 part Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) with 5 parts water.
(d) Clean the APU external surface using Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) .
(e) Let the cleaning agent soak on the surface for a maximum of 20 minutes.
(f) Flush the APU external surface with clean water to remove the remaining cleaning agent.
(g) Dry the APU external surface with a Textile-Lint free Cotton - (Material No.14SBA1) .
(h) Do an inspection of the APU external surface after the cleaning procedure. Do the process again as necessary.
(2) Cleaning of the APU and/or air intake system with steam:
(a) If you remove a component, identify the area.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Prepare cleaning solution as follows:
1 Maximum mix ratio: 1 part Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) with 5 parts water.
(d) Clean the APU external surface using Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) .
(e) Let the cleaning agent soak on the surface for a maximum of 20 minutes.
(f) Flush the cleaning agent from the surface with CLEANING EQUIPMENT - STEAM:
1 Hold the nozzle at an angle of approximately 45 degrees and 8 IN. (203.2 MM) to 10 IN. (254.0 MM) from the clean surface.
2 Do not spray directly into air inlet or exhaust.
3 Do not put directly in contact with the electrical harness and plugs.
4 Do an inspection of the APU external surface after the cleaning procedure. Do the process again as necessary.
5. Close-upNOTE: There are two procedures to clean the APU external surface, cleaning with your hand or cleaning with steam.
(1) Cleaning of the APU and/or air intake system with your hand:(a) If you remove a component, identify the area.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Prepare the cleaning solution as follows:
1 Maximum mix ratio: 1 part Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) with 5 parts water.
(d) Clean the APU external surface using Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) .
(e) Let the cleaning agent soak on the surface for a maximum of 20 minutes.
(f) Flush the APU external surface with clean water to remove the remaining cleaning agent.
(g) Dry the APU external surface with a Textile-Lint free Cotton - (Material No.14SBA1) .
(h) Do an inspection of the APU external surface after the cleaning procedure. Do the process again as necessary.
WARNING:
WHEN YOU USE COMPRESSED AIR:
- USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
CAUTION:
DO THE DRYING PROCEDURE MAXIMUM FOUR HOURS AFTER THE WET CLEANING PROCEDURE TO PREVENT CORROSION.
(i) Use a BLOWING EQUIPMENT - DRY AIR to blow clean compressed air until the APU external surface is free of moisture.(2) Cleaning of the APU and/or air intake system with steam:
(a) If you remove a component, identify the area.
(b) Put the CAP-BLANKING on each disconnected electrical connector and receptacle.
(c) Prepare cleaning solution as follows:
1 Maximum mix ratio: 1 part Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) with 5 parts water.
(d) Clean the APU external surface using Aqueous Cleaner-Turbine Engine Gas Path - - (Material No.08AJA1) .
(e) Let the cleaning agent soak on the surface for a maximum of 20 minutes.
(f) Flush the cleaning agent from the surface with CLEANING EQUIPMENT - STEAM:
1 Hold the nozzle at an angle of approximately 45 degrees and 8 IN. (203.2 MM) to 10 IN. (254.0 MM) from the clean surface.
2 Do not spray directly into air inlet or exhaust.
3 Do not put directly in contact with the electrical harness and plugs.
4 Do an inspection of the APU external surface after the cleaning procedure. Do the process again as necessary.
WARNING:
WHEN YOU USE COMPRESSED AIR:
- USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
CAUTION:
DO THE DRYING PROCEDURE MAXIMUM FOUR HOURS AFTER THE WET CLEANING PROCEDURE TO PREVENT CORROSION.
(g) Use a BLOWING EQUIPMENT - DRY AIR to blow clean compressed air until the APU external surface is free of moisture.Subtask 49-00-00-410-105-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 49-00-00-865-215-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 49-00-00-860-221-A ** ON A/C NOT FOR ALL | 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 |
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).