DOC AIRBUS | AMM A320FRemove Air/Oil Cooler for Cleaning (131-9(A))
TASK 49-91-44-100-003-A
Remove Air/Oil Cooler for Cleaning (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 49-91-44-860-065-A ** ON A/C NOT FOR ALL
Subtask 49-91-44-100-053-A ** ON A/C NOT FOR ALL
Subtask 49-91-44-410-059-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.01 01:33:34 UTC
Remove Air/Oil Cooler for Cleaning (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:
WHEN YOU USE COMPRESSED AIR:
- USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
WARNING:
BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION:
PUT PLASTIC CAPS OR PLUGS ON ALL FUEL AND/OR LUBRICATION SYSTEM COMPONENTS AND LINES. IF YOU USE TAPE, CLOTH, OR METAL CAPS ON THEM, YOU CAN DAMAGE THE APU.
ZONE: 315
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 | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.08AJA9) | Aqueous Cleaner-Turbine Engine Gas Path - Legacy |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 315 | TAIL CONE APU AND ACCESSORY COMPARTMENT |
| 315AL, 316AR |
| REFERENCE | DESIGNATION |
|---|---|
| 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 49-20-00-600-803-A | APU Preservation / Storage / Return to Service (131-9(A)) |
| TASK 49-91-44-000-004-A | Removal of the Oil Cooler (131-9(A)) |
| TASK 49-91-44-400-004-A | Installation of the Oil Cooler (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 |
Subtask 49-91-44-860-065-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 49-91-44-865-073-A ** ON A/C NOT FOR ALL (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).
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 49-91-44-010-060-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 the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU compartment.
(2) Open the APU access doors 315AL 316AR and (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT SW 11LJ to the ON position.
4. Procedure(1) Put the ACCESS PLATFORM 4M (13 FT)-ADJUSTABLE below the APU compartment.
(2) Open the APU access doors 315AL 316AR and (Ref. AMM TASK 52-41-00-010-001).
(3) Set the LIGHT SW 11LJ to the ON position.
Subtask 49-91-44-100-053-A ** ON A/C NOT FOR ALL
A. Cleaning of Oil Cooler
(a) Remove the oil cooler (Ref. AMM TASK 49-91-44-000-004).
(b) Put PLUG - BLANKING on the oil inlet and outlet ports.
(c) Prepare the cleaning agent as given in the manufacturers instructions.
(d) Fill the cleaning tank with sufficient Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to immerse the oil cooler.
(e) If the oil cooler has a large quantity of contamination, heat the cleaning agent to the recommended temperature, refer to manufacturers instructions.
(g) Shake the oil cooler to remove any remaining air.
(h) Flush the cleaning agent through the cooler matrix to help make the cleaning time faster.
(i) Remove the oil cooler from the cleaning tank and drain fully.
(j) Flush the oil cooler with clean water.
(k) Do a visual inspection as given in paragraph (3).
(2) Cleaning with Steam
(b) Put blanking plugs on the oil inlet and outlet ports.
(c) Prepare the steam cleaning solution as given in the manufacturers instructions.
(d) Add a small quantity of Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to the water to help remove large quantity contamination from the oil cooler.
(e) Set the pressure of the steam cleaner to between 1.7 bar (24.6564 psi) and 2.0 bar (29.0075 psi).
(g) Flush the oil cooler with clean water until the cleaning agent is fully removed.
(h) Do the visual inspection given in paragraph (3).
(3) Visual inspection of the oil cooler.
(b) Point a light through the matrix and do a check to make sure that it is clean and free from contamination.
1 If you find signs of contamination and only if the total immersion time is in the four hours limit, do the cleaning of the oil cooler again.
(4) Drying of the oil cooler.
(b) Remove the PLUG - BLANKING from the oil inlet and outlet ports.
(c) If the oil cooler is to be installed on an APU to go on storage:
1 Put the oil cooler into an oven at the temperature of 121 deg.C (249.80 deg.F) plus/minus 14 deg.C (57.20 deg.F).
2 Keep the oil cooler in the oven for a minimum of 2 hours or until the oil cooler is dry.
3 Remove the oil cooler from the oven and while hot, blow compressed air through it to remove any moisture.
4 Do the drying process again until the cooler is fully dry.
5 Install the oil cooler (Ref. AMM TASK 49-91-44-400-004).
6 Do the preservation/storage procedure of the APU (Ref. AMM TASK 49-20-00-600-803).
(d) If the APU is on-wing:
1 Blow compressed air through it to remove any moisture.
2 Install the oil cooler (Ref. AMM TASK 49-91-44-400-004).
3 Start and operate the APU for 15 minutes to dry the oil cooler (Ref. AMM TASK 49-00-00-860-008).
5. Close-upNOTE: Two alternative procedures are used to clean the oil cooler, by immersion or with steam. The two procedures are given as follows.
(1) Cleaning by Immersion. (a) Remove the oil cooler (Ref. AMM TASK 49-91-44-000-004).
(b) Put PLUG - BLANKING on the oil inlet and outlet ports.
(c) Prepare the cleaning agent as given in the manufacturers instructions.
(d) Fill the cleaning tank with sufficient Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to immerse the oil cooler.
(e) If the oil cooler has a large quantity of contamination, heat the cleaning agent to the recommended temperature, refer to manufacturers instructions.
CAUTION:
DO NOT LET THE OIL COOLER STAY IN THE CLEANING AGENT FOR MORE THAN FOUR HOURS. AFTER THIS TIME, THE CLEANING AGENT WILL CAUSE DAMAGE TO THE OIL COOLER COVERING.
(f) Immerse the oil cooler in the cleaning agent for a maximum working time of four hours. (g) Shake the oil cooler to remove any remaining air.
(h) Flush the cleaning agent through the cooler matrix to help make the cleaning time faster.
(i) Remove the oil cooler from the cleaning tank and drain fully.
(j) Flush the oil cooler with clean water.
(k) Do a visual inspection as given in paragraph (3).
(2) Cleaning with Steam
CAUTION:
KEEP THE WAND TIP 30 CENTIMETERS (12 INCHES) AWAY FROM THE OIL COOLER MATRIX. THE STEAM PRESSURE FROM THE WAND CAN BEND THE MATRIX VANES AND REMOVE THE PROTECTIVE COATING.
(a) Remove the oil cooler. (Ref. AMM TASK 49-91-44-000-004)(b) Put blanking plugs on the oil inlet and outlet ports.
(c) Prepare the steam cleaning solution as given in the manufacturers instructions.
(d) Add a small quantity of Aqueous Cleaner-Turbine Engine Gas Path - Legacy (Material No.08AJA9) to the water to help remove large quantity contamination from the oil cooler.
(e) Set the pressure of the steam cleaner to between 1.7 bar (24.6564 psi) and 2.0 bar (29.0075 psi).
WARNING:
WHEN YOU USE COMPRESSED AIR:
(f) Point the cleaner spray through the matrix of the oil cooler until all signs of contamination are removed, turn the oil cooler as you clean it. - USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
(g) Flush the oil cooler with clean water until the cleaning agent is fully removed.
(h) Do the visual inspection given in paragraph (3).
(3) Visual inspection of the oil cooler.
WARNING:
WHEN YOU USE COMPRESSED AIR:
(a) Blow any remaining water out of the cooler matrix with compressed air, use a maximum pressure of 2.0 bar (29.0075 psi)- USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
(b) Point a light through the matrix and do a check to make sure that it is clean and free from contamination.
1 If you find signs of contamination and only if the total immersion time is in the four hours limit, do the cleaning of the oil cooler again.
NOTE: If the oil cooler cannot be cleaned correctly, return the oil cooler to the workshop.
2 If you do not find signs of contamination, do the drying of the oil cooler. (4) Drying of the oil cooler.
WARNING:
WHEN YOU USE COMPRESSED AIR:
- USE THE CORRECT PROTECTION (FACE SHIELD OR GOGGLES)
- DO NOT POINT THE AIRFLOW AT YOURSELF OR OTHER PERSONS.
WARNING:
USE THERMAL GLOVES WHEN YOU MOVE OR TOUCH HOT OR COLD PARTS. HOT OR COLD PARTS CAN CAUSE INJURY.
CAUTION:
DO THE DRYING PROCEDURE MAXIMUM FOUR HOURS AFTER THE WET CLEANING PROCEDURE TO PREVENT CORROSION.
(a) Remove as much water as possible from the oil cooler with the compressed air. (b) Remove the PLUG - BLANKING from the oil inlet and outlet ports.
(c) If the oil cooler is to be installed on an APU to go on storage:
1 Put the oil cooler into an oven at the temperature of 121 deg.C (249.80 deg.F) plus/minus 14 deg.C (57.20 deg.F).
2 Keep the oil cooler in the oven for a minimum of 2 hours or until the oil cooler is dry.
3 Remove the oil cooler from the oven and while hot, blow compressed air through it to remove any moisture.
4 Do the drying process again until the cooler is fully dry.
5 Install the oil cooler (Ref. AMM TASK 49-91-44-400-004).
6 Do the preservation/storage procedure of the APU (Ref. AMM TASK 49-20-00-600-803).
(d) If the APU is on-wing:
1 Blow compressed air through it to remove any moisture.
2 Install the oil cooler (Ref. AMM TASK 49-91-44-400-004).
3 Start and operate the APU for 15 minutes to dry the oil cooler (Ref. AMM TASK 49-00-00-860-008).
Subtask 49-91-44-410-059-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) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Set the LIGHT SW 11LJ to the OFF position.
(4) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(5) Remove the access platform(s).
Subtask 49-91-44-865-076-A ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
(3) Set the LIGHT SW 11LJ to the OFF position.
(4) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(5) Remove the access platform(s).
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 49-91-44-860-066-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).