DOC AIRBUS | AMM A320FOperational Test of the Air Supply System (with ground air supply)
TASK 38-41-00-710-001-A
Operational Test of the Air Supply System (with ground air supply)
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 38-41-00-861-050-A Subtask 38-41-00-010-051-A ** ON A/C NOT FOR ALL
Subtask 38-41-00-710-050-B
Subtask 38-41-00-614-050-A Subtask 38-41-00-080-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:25:59 UTC
Operational Test of the Air Supply System (with ground air supply)
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 1M(3 FT) |
| No specific | 1 | GAGE 5 BAR (75 PSI) - PRESSURE |
| No specific | 1 | GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) |
| REFERENCE | DESIGNATION |
|---|---|
| No specific | water |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 171AL | |
| 131NW, 131PW | |
| 161DW |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 12-15-38-613-001-A | Fill the Potable Water Tank System (Aircraft Electrical Power Available) |
| 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 38-10-00-614-002-A | Depressurization of the Potable Water System |
| TASK 52-30-00-860-001-A | Open the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
| TASK 52-30-00-860-002-A | Close the FWD or Aft Cargo-Compartment Door with the Yellow Electric Pump |
Manometer Attach PointSubtask 38-41-00-861-050-A Subtask 38-41-00-010-051-A ** ON A/C NOT FOR ALL
B. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 171.
(2) Open the service door 171AL.
(3) Open the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(4) Open the partition panel 161DW.
Subtask 38-41-00-010-051-B ** ON A/C NOT FOR ALL (1) Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 171.
(2) Open the service door 171AL.
(3) Open the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(4) Open the partition panel 161DW.
B. Get Access
(1) Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 138.
(2) Open the service door 171AL.
(3) Open the FWD cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(4) Open the partitions 131PW 131NW.
Subtask 38-41-00-614-053-A ** ON A/C NOT FOR ALL (1) Put the ACCESS PLATFORM 1M(3 FT) in position at Zone 138.
(2) Open the service door 171AL.
(3) Open the FWD cargo-compartment door (Ref. AMM TASK 52-30-00-860-001).
(4) Open the partitions 131PW 131NW.
C. Release of the Pressure from the Potable Water System
(1) Turn and pull the fill and drain handle at the service panel 2023VU from the NORMAL to the FILL position.
(2) Operate the water faucet in the lavatories to let air into the system.
(3) Turn the fill and drain handle back to the NORMAL position.
Subtask 38-41-00-614-053-B ** ON A/C NOT FOR ALL (1) Turn and pull the fill and drain handle at the service panel 2023VU from the NORMAL to the FILL position.
(2) Operate the water faucet in the lavatories to let air into the system.
(3) Turn the fill and drain handle back to the NORMAL position.
C. Release the pressure from the potable water system.
(1) Press the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH until the light comes on.
(3) Press the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH again to close the depressurization valve 4MD after the system is depressurized.
Subtask 38-41-00-614-053-C ** ON A/C NOT FOR ALL (1) Press the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH until the light comes on.
NOTE: The light in the membrane switch comes on when the depressurization valve 4MD opens.
(2) Operate the water faucet in the lavatories to let air into the system. (3) Press the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH again to close the depressurization valve 4MD after the system is depressurized.
NOTE: The light in the membrane switch goes out when the depressurization valve 4MD is closed.
NOTE: In cold weather conditions the depressurization valve 4MD must stay open. Do not press the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH again after the system is depressurized.
NOTE: Before flight, make sure that the light in the membrane switch 'WATER SYS DEPRESS' on the FAP 124RH is not ON.
C. Release the Pressure from the Potable Water System
(1) Push the 'WATER DEPRESS' button on the FAP 120RH:
(3) Return the Potable water System back to the normal condition:
(a) Push the 'WATER DEPRESS' button on the FAP 120RH again.
(b) The green light in the 'WATER DEPRESS' button is off.
(4) No more messages are shown on the FAP.
Subtask 38-41-00-480-050-A ** ON A/C NOT FOR ALL (1) Push the 'WATER DEPRESS' button on the FAP 120RH:
- The green light in the button comes on.
- The message 'VACUUM SYSTEM DISABLED - WATER DEPRESS ACTIVE' comes on.
- On the aircraft symbol 'NO WATER PRESSURE' comes in view.
NOTE: The green light in the 'WATER DEPRESS' button comes on when the depressurization valve 4MD opens.
(2) Operate the water faucet in the lavatories to let air into the system. (3) Return the Potable water System back to the normal condition:
(a) Push the 'WATER DEPRESS' button on the FAP 120RH again.
(b) The green light in the 'WATER DEPRESS' button is off.
(4) No more messages are shown on the FAP.
D. Installation of the Test Equipment
(1) Remove the blanking plug from the test port downstream of the pressure reducing and relief valve.
(2) Connect a GAGE 5 BAR (75 PSI) - PRESSURE to the test port.
(3) Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the ground air-pressure connection at the potable water service panel.
Subtask 38-41-00-480-050-B ** ON A/C NOT FOR ALL (1) Remove the blanking plug from the test port downstream of the pressure reducing and relief valve.
(2) Connect a GAGE 5 BAR (75 PSI) - PRESSURE to the test port.
(3) Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the ground air-pressure connection at the potable water service panel.
D. Installation of the Test Equipment
(1) Remove the exhaust nut at the depressurization valve 4MD.
(2) Connect a GAGE 5 BAR (75 PSI) - PRESSURE to the test port.
(3) Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the ground air-pressure connection at the potable water service panel.
Subtask 38-41-00-613-050-A 4. Procedure(1) Remove the exhaust nut at the depressurization valve 4MD.
(2) Connect a GAGE 5 BAR (75 PSI) - PRESSURE to the test port.
(3) Connect the GROUND AIR-SUPPLY UNIT(HIGH PRESSURE) to the ground air-pressure connection at the potable water service panel.
Subtask 38-41-00-710-050-B
A. Do this test.
5. Close-up| ACTION | RESULT |
|---|---|
1.At the service panel 2023VU:
| In the potable water air system:
|
2.At the service panel 2023VU:
| In the potable water air system:
|
3.At the service panel 2023VU:
| In the potable water air system:
|
4.At the service panel 2023VU:
| In the potable water air system:
|
5.In one of the lavatories:
| In the lavatory:
NOTE: When the pressure in the potable water system decreases, the pressure reducing valve starts the air supply to the system again. |
6.At the service panel 2023VU:
| |
Subtask 38-41-00-614-050-A Subtask 38-41-00-080-050-A ** ON A/C NOT FOR ALL
B. Removal of the Test Equipment
(1) Disconnect the ground air-supply cart.
(2) Disconnect the manometer from the test port.
(3) Install the blanking plug to the test port.
Subtask 38-41-00-080-050-B ** ON A/C NOT FOR ALL (1) Disconnect the ground air-supply cart.
(2) Disconnect the manometer from the test port.
(3) Install the blanking plug to the test port.
B. Removal of the Test Equipment
(1) Disconnect the ground air-supply cart.
(2) Disconnect the manometer from the test port at the relief valve 4MD.
(3) Install the exhaust nut to the test port.
Subtask 38-41-00-410-051-A ** ON A/C NOT FOR ALL (1) Disconnect the ground air-supply cart.
(2) Disconnect the manometer from the test port at the relief valve 4MD.
(3) Install the exhaust nut to the test port.
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the partition panel 161DW.
(3) Close the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) Close the service door 171AL.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 38-41-00-410-051-B ** ON A/C NOT FOR ALL (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the partition panel 161DW.
(3) Close the AFT cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) Close the service door 171AL.
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
C. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panels 131PW 131NW 171AL.
(3) Close the FWD cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 38-41-00-862-050-A (1) Make sure that the work area is clean and clear of tools and other items.
(2) Close the access panels 131PW 131NW 171AL.
(3) Close the FWD cargo-compartment door (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the ground support and maintenance equipment, the special and standard tools and all other items.