DOC AIRBUS | AMM A320FInstallation of the Hot Air-Pressure Switch
TASK 21-63-19-400-001-A
Installation of the Hot Air-Pressure Switch
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Consumable Materials
C. Work Zones and Access Panels
D. Expendable Parts
E. Referenced Information
3. Job Set-up
Subtask 21-63-19-860-050-A
Subtask 21-63-19-420-050-A
Subtask 21-63-19-865-052-A
[Rev.10 from 2021]
2026.04.02 06:11:44 UTC
Installation of the Hot Air-Pressure Switch
WARNING:
MAKE SURE THAT AIR IS NOT SUPPLIED TO THE AIR CONDITIONING SYSTEM FROM THE MAIN ENGINE, THE APU OR A GROUND SOURCE.
HOT COMPRESSED AIR CAN CAUSE INJURY TO PERSONNEL.
WARNING:
MAKE SURE THAT THE COMPONENTS OF THE BLEED AIR SYSTEM ARE COOL. HOT COMPONENTS WILL BURN YOU.
CAUTION:
BE VERY CAREFUL WHEN YOU DO WORK ON OR NEAR THE AIR-CONDITIONING DUCTS. THE DUCTS ARE MADE OF THIN MATERIAL AND YOU CAN EASILY BREAK THEM.
FIN: 26HK
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 2M (6 FT) |
| No specific | AR | WARNING NOTICE(S) |
| REFERENCE | DESIGNATION |
|---|---|
| (Material No.14QDB1) | Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy - |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 191CB, 191DB, 825 |
| FIG.ITEM | DESIGNATION | IPC-CSN |
|---|---|---|
| 3 | O-RING | AIPC 21-63-03-07-400 |
| 3 | O-RING | AIPC 21-63-83-01-470 |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-63-00-710-004-A | Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU |
| 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 25-54-12-000-001-A | Removal of the Forward Cargo-Compartment Partition |
| TASK 25-54-12-400-001-A | Installation of the Forward Cargo-Compartment Partition |
| 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 |
Hot Air-Pressure SwitchSubtask 21-63-19-860-050-A
A. Aircraft Maintenance Configuration
(1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) In the cockpit, on AIR COND panel 30VU:
(a) Make sure that the APU BLEED pushbutton switch is released (the OFF legend is on).
(b) Make sure that the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
(c) Make sure that the PACK 1 and the PACK 2 pushbutton switches are released (the OFF legends are on).
(d) Make sure that the HOT AIR pushbutton switch is released (the OFF legend is on).
(e) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate these pushbutton switches.
(3) At access doors 191CB and 191DB:
(a) On the LP and the HP ground connectors, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to supply the ground air.
(4) Make sure that forward cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at forward cargo-compartment door 825.
(6) Make sure that the access panels at partition FR 34 are removed (Ref. AMM TASK 25-54-12-000-001).
Subtask 21-63-19-865-051-A (1) Make sure that the aircraft electrical circuits are energized
(Ref. AMM TASK 24-41-00-861-002).
(2) In the cockpit, on AIR COND panel 30VU:
(a) Make sure that the APU BLEED pushbutton switch is released (the OFF legend is on).
(b) Make sure that the ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
(c) Make sure that the PACK 1 and the PACK 2 pushbutton switches are released (the OFF legends are on).
(d) Make sure that the HOT AIR pushbutton switch is released (the OFF legend is on).
(e) Make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to operate these pushbutton switches.
(3) At access doors 191CB and 191DB:
(a) On the LP and the HP ground connectors, make sure that the WARNING NOTICE(S) is (are) in position to tell persons not to supply the ground air.
(4) Make sure that forward cargo-compartment door 825 is open (Ref. AMM TASK 52-30-00-860-001).
(5) Make sure that the ACCESS PLATFORM 2M (6 FT) is in position at forward cargo-compartment door 825.
(6) Make sure that the access panels at partition FR 34 are removed (Ref. AMM TASK 25-54-12-000-001).
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| ** ON A/C NOT FOR ALL | |||
| 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 NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |
Subtask 21-63-19-420-050-A
A. Installation of the Pressure Switch
(1) Remove the blanking plugs from the disconnected line ends.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean the component interfaces and the adjacent area.
(4) Make sure that the O-ring (3) is in a good condition. If necessary replace the AIPC 21-63-03-07-400 O-RING (3) or AIPC 21-63-83-01-470 O-RING (3).
(5) Put the O-ring (3) in position on the pressure switch (2).
(6) Install the pressure switch (2) and tighten.
(7) Safety the pressure switch (2) with14QDB1 Wire-Locking Dia: 0.5 mm (0.020 inch) CRES Nickel Alloy -
(8) Remove the blanking caps from the disconnected electrical connectors.
(9) Make sure that all the electrical connections are clean and in the correct condition.
Subtask 21-63-19-710-050-A (1) Remove the blanking plugs from the disconnected line ends.
(2) Make sure that the parts retained from the removed component are clean and in the correct condition.
(3) Clean the component interfaces and the adjacent area.
(4) Make sure that the O-ring (3) is in a good condition. If necessary replace the AIPC 21-63-03-07-400 O-RING (3) or AIPC 21-63-83-01-470 O-RING (3).
(5) Put the O-ring (3) in position on the pressure switch (2).
(6) Install the pressure switch (2) and tighten.
(7) Safety the pressure switch (2) with
(8) Remove the blanking caps from the disconnected electrical connectors.
(9) Make sure that all the electrical connections are clean and in the correct condition.
CAUTION:
TO PREVENT POSSIBLE CROSS-CONNECTION OF THE ELECTRICAL CONNECTORS, MAKE SURE THAT PLUGS AND RECEPTACLES ARE CLEARLY IDENTIFIED.
(10) Connect the electrical connector (1). NOTE: Make sure that the electrical connector 26HK-A is connected to the pressure switch 26HK.
(11) Make sure that the work area is clean and clear of tools and other items.B. Do an operational test of the cockpit and cabin temperature control (Ref. AMM TASK 21-63-00-710-004).
5. Close-upSubtask 21-63-19-865-052-A
A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-63-19-410-050-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| ** ON A/C NOT FOR ALL | |||
| 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 NOT FOR ALL | |||
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/115VAC | 53HH | W22 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN A/28VDC | 55HH | W21 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/115VAC | 49HH | X22 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN A/28VDC | 51HH | X21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/28VDC | 56HH | Y21 |
| 122VU | AIR COND/TEMP CTL SYS 2/CHAN B/115VAC | 54HH | Y20 |
| 122VU | AIR COND/TEMP CTL SYS 1/CHAN B/115VAC | 50HH | Y18 |
B. Close Access
(1) Install the access panel at partition FR 34 (Ref. AMM TASK 25-54-12-400-001).
(2) Remove the access platform(s).
(3) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the WARNING NOTICE(S).
Subtask 21-63-19-862-050-A (1) Install the access panel at partition FR 34 (Ref. AMM TASK 25-54-12-400-001).
(2) Remove the access platform(s).
(3) Close forward cargo-compartment door 825 (Ref. AMM TASK 52-30-00-860-002).
(4) Remove the WARNING NOTICE(S).