DOC AIRBUS | AMM A320FPre-conditioning through the HP Ground Connection
TASK 12-33-21-618-001-A-01
Pre-conditioning through the HP Ground Connection
For maintenance procedures
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Work Zones and Access Panels
C. Referenced Information
3. Job Set-up
Subtask 12-33-21-865-053-A
Subtask 12-33-21-618-054-A ** ON A/C NOT FOR ALL
Subtask 12-33-21-410-054-A
[Rev.10 from 2021]
2026.03.31 22:58:13 UTC
Pre-conditioning through the HP Ground Connection
WARNING:
MAKE SURE THAT THE GROUND SAFETY-LOCKS ARE IN POSITION ON THE LANDING GEAR. THIS WILL PREVENT UNWANTED MOVEMENT OF THE LANDING GEAR, AND THUS POSSIBLE INJURY TO PERSONS AND DAMAGE TO THE AIRCRAFT AND/OR EQUIPMENT.
WARNING:
MAKE SURE THAT DURING THIS PROCEDURE THE AIRCRAFT IS IN ONE OF THESE THREE CONDITIONS:
- THE CABIN PRESSURE OUTFLOW VALVE IS OPEN.
- THE FWD AVIONICS COMPARTMENT ACCESS DOOR 811 IS OPEN.
- ONE OR MORE PASSENGER DOORS ARE OPEN.
CAUTION:
DO NOT USE CONDITIONED AIR FROM THE APU OR HIGH-PRESSURE GROUND UNIT AT THE SAME TIME AS AIR FROM THE LOW-PRESSURE GROUND UNIT. IF YOU DO NOT OBEY THIS PRECAUTION, DAMAGE TO THE CHECK VALVES OR THE AIRCRAFT CAN OCCUR.
CAUTION:
MAKE SURE THAT THE GROUND-AIR SUPPLY IS FREE FROM OIL CONTAMINATION. OIL CONTAMINATION CAN CAUSE THE SMELL OF OIL IN THE CABIN AND MAKE THE AIR-CONDITIONING PACKS UNSERVICEABLE.
CAUTION:
MAKE SURE THAT THE GROUND AIR-SUPPLY UNIT IS NOT TOO NEAR THE AIRCRAFT AND THAT THE ENGINE EXHAUST PIPE OF THE GROUND AIR- SUPPLY UNIT POINTS AWAY FROM THE AIRCRAFT. HEAT FROM THIS UNIT AND FROM THE EXHAUST CAN CAUSE DAMAGE TO THE AIRCRAFT STRUCTURE.
CAUTION:
DO NOT USE A GROUND POWER UNIT WITH A CAPACITY LESS THAN 90 KVA. IF YOU USE A LESS POWERFUL UNIT:
- AN OVERLOAD OF THE GROUND POWER UNIT COULD OCCUR
- IT COULD BE NECESSARY TO RESET MANY COMPUTERS ON THE AIRCRAFT.
NOTE: The ground air-supply unit supplies air to the air conditioning packs 10HM/11HM.
1. Reason for the JobFor maintenance procedures
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | 1 | ACCESS PLATFORM 2M (6 FT) |
| No specific | AR | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 191DB, 811 |
| 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 31-60-00-860-001-A | EIS Start Procedure |
| TASK 31-60-00-860-002-A | EIS Stop Procedure |
LP and HP Ground ConnectorsSubtask 12-33-21-865-053-A
A. Make sure that this(these) circuit breaker(s) is(are) closed:
Subtask 12-33-21-860-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/FLOW/CTL &/IND1 | 1HB | D07 |
| ** ON A/C ALL | |||
| 49VU | AIR COND/AVNCS VENT/CTL | 6HQ | D06 |
| 49VU | AIR COND/AVNCS VENT/CTL | 5HQ | D05 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR COND/FLOW/MIXER/FLAP | 3HB | V22 |
| 122VU | AIR COND/FLOW/CTL AND IND/2 | 2HB | V21 |
| 122VU | AIR COND/ZONE TEMP CTL/28VDC/SYS2 | 4HK | V20 |
| 122VU | AIR COND/ZONE TEMP CTL/28VDC/SYS1 | 3HK | V19 |
| 122VU | AIR COND/ZONE TEMP CTL/115VAC/SYS2 | 2HK | V18 |
| 122VU | AIR COND/ZONE TEMP CTL/115VAC/SYS1 | 1HK | V17 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/115VAC | 21HH | W22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/2/28VDC | 23HH | W21 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/115VAC | 1HH | X22 |
| 122VU | AIR COND/PACK TEMP/CTL SYS1/1/28VDC | 3HH | X21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| ** ON A/C ALL | |||
| 122VU | AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/CTL | 5HU | U21 |
| 122VU | AIR COND/LAV/GALLEY VENT CTL/EXTRACT FAN/SPLY | 6HU | U19 |
| 122VU | AIR COND/RECIRC FAN/R/CTL | 11HG | W20 |
| 122VU | AIR COND/RECIRC FAN/R/SPLY | 3HG | W18 |
| 122VU | AIR COND/RECIRC FAN/L/CTL | 2HG | X20 |
| 122VU | AIR COND/RECIRC FAN/L/SPLY | 1HG | X18 |
| 122VU | AIR COND/AVNCS/VENT/MONG | 3HQ | Y17 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AE02 |
| ** ON A/C ALL | |||
| 123VU | AVNCS VENT/BLOWER/FAN | 1HQ | AD10 |
| ** ON A/C NOT FOR ALL | |||
| 123VU | AVNCS VENT/EXTC/FAN | 2HQ | AC04 |
B. Aircraft Maintenance Configuration
(1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the panel 30VU make sure that:
Subtask 12-33-21-010-054-A (1) Energize the aircraft electrical circuits (Ref. AMM TASK 24-41-00-861-002).
(2) Do the EIS start procedure (Ref. AMM TASK 31-60-00-860-001).
(3) On the panel 30VU make sure that:
- the PACK 1 and the PACK 2 pushbutton switches are in the on position (the FAULT legends are on and the OFF legends are off),
- the COCKPIT, FWD CABIN and AFT CABIN temperature selectors are at the 12 o'clock position,
- the HOT AIR pushbutton switch is in the on position (the OFF legend is off),
- the X BLEED rotary switch is set to the OPEN position.
C. Get Access
(1) Open the access door 191DB.
(2) Connect the GROUND AIR SUPPLY UNIT (HIGH PRESSURE) to the aircraft High Pressure (HP) connector(s).
Subtask 12-33-21-941-053-A (1) Open the access door 191DB.
(2) Connect the GROUND AIR SUPPLY UNIT (HIGH PRESSURE) to the aircraft High Pressure (HP) connector(s).
D. Do at least one of the following safety precautions:
(1) Make sure that the cabin pressure Outflow Valve (OFV) is open.
(a) On the overhead panel, on the CABIN PRESS section of the control panel 25VU:
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the FWD avionics compartment access door 811.
(b) Open the FWD avionics compartment access door 811.
(3) Or make sure that at least one cabin door is safe in open position.
4. Procedure(1) Make sure that the cabin pressure Outflow Valve (OFV) is open.
(a) On the overhead panel, on the CABIN PRESS section of the control panel 25VU:
- Put a warning notice in position to tell persons not to close the OFV.
(a) Put the ACCESS PLATFORM 2M (6 FT) in position below the FWD avionics compartment access door 811.
(b) Open the FWD avionics compartment access door 811.
(3) Or make sure that at least one cabin door is safe in open position.
- Put a WARNING NOTICE(S) in position to tell persons not to close the cabin door.
Subtask 12-33-21-618-054-A ** ON A/C NOT FOR ALL
A. Pre-conditioning through the HP Ground Connection
(1) Start the ground air-supply unit and make sure that:
Subtask 12-33-21-618-054-B ** ON A/C NOT FOR ALL (1) Start the ground air-supply unit and make sure that:
- the airflow is between 54 kg.min (119.0496 lb.min) and 78 kg.min (171.9605 lb.min),
- the supplied air pressure is not more than 4.1 bar (59.4655 psi),
- the supplied air temperature does not go above 260 deg.C (500.00 deg.F).
NOTE: On the panel 30VU:
On the PACK 1 and the PACK 2 pushbutton switches the FAULT legends go off when the flow control valves open.
(2) On the AIR BLEED page of the ECAM lower DU, make sure that the pack discharge-temperature indication is normal (i.e. green indication). On the PACK 1 and the PACK 2 pushbutton switches the FAULT legends go off when the flow control valves open.
A. Pre-conditioning through the HP Ground Connection
(1) Start the ground air-supply unit and make sure that:
Subtask 12-33-21-618-057-A (1) Start the ground air-supply unit and make sure that:
- the airflow is between 63 kg.min (138.8912 lb.min) and 96 kg.min (211.6437 lb.min),
- the supplied air pressure is not more than 4.1 bar (59.4655 psi),
- the supplied air temperature does not go above 260 deg.C (500.00 deg.F).
NOTE: On the panel 30VU:
On the PACK 1 and the PACK 2 pushbutton switches the FAULT legends go off when the flow control valves open.
(2) On the AIR BLEED page of the ECAM lower DU, make sure that the pack discharge-temperature indication is normal (i.e. green indication). On the PACK 1 and the PACK 2 pushbutton switches the FAULT legends go off when the flow control valves open.
B. When the pre-conditioning is no longer necessary:
(1) On the panel 30VU:
5. Close-up(1) On the panel 30VU:
- push the PACK 1 and the PACK 2 pushbutton switches to the off position (the OFF legends come on).
- push the HOT AIR pushbutton switch to the off position (the OFF legend comes on).
- push the CAB FANS pushbutton switch to the off position (the OFF legend comes on).
Subtask 12-33-21-410-054-A
A. Close Access
(1) Disconnect and remove the ground air-supply unit from the aircraft High Pressure (HP) connector(s).
(2) Close the access door 191DB.
(3) Close the FWD avionics compartment access door 811 if opened.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
Subtask 12-33-21-860-051-A (1) Disconnect and remove the ground air-supply unit from the aircraft High Pressure (HP) connector(s).
(2) Close the access door 191DB.
(3) Close the FWD avionics compartment access door 811 if opened.
(4) Remove the WARNING NOTICE(S).
(5) Remove the ground support and maintenance equipment, the special and standard tools and all other items.
B. Aircraft Maintenance Configuration
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-862-002)
(1) Do the EIS stop procedure
(Ref. AMM TASK 31-60-00-860-002).
(2) De-energize the aircraft electrical circuits. (Ref. AMM TASK 24-41-00-862-002)