DOC AIRBUS | AMM A320FRemoval of the CSAS Isolation Valve
TASK 21-58-51-000-001-A
Removal of the CSAS Isolation Valve
Self explanatory
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 21-58-51-861-050-A ** ON A/C NOT FOR ALL Subtask 21-58-51-865-053-A ** ON A/C NOT FOR ALL
Subtask 21-58-51-020-050-A ** ON A/C NOT FOR ALL
[Rev.10 from 2021]
2026.04.02 06:11:35 UTC
Removal of the CSAS Isolation Valve
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:
DO NOT TOUCH THE COMPONENT UNTIL IT IS SUFFICIENTLY
COOL TO PREVENT BURNS.
FIN: 111HW ** ON A/C NOT FOR ALL
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 | CAP - BLANKING |
| No specific | AR | PLUG - BLANKING |
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| No specific | 1 | WARNING NOTICE(S) |
| ZONE/ACCESS | ZONE DESCRIPTION |
|---|---|
| 191BB |
| 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 53-35-13-000-002-A | Removal of the Quick-Release Access Panels from the Belly Fairing Structure |
CSAS Isolation Valve (111HW)Subtask 21-58-51-861-050-A ** ON A/C NOT FOR ALL Subtask 21-58-51-865-053-A ** ON A/C NOT FOR ALL
B. Open, safety and tag this(these) circuit breaker(s):
Subtask 21-58-51-941-050-A ** ON A/C NOT FOR ALL | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR BLEED/X FEED/VALVE/BAT | 2HV | D13 |
| 49VU | AIR COND/TEMP CTL/SYS 1 CHAN B/28VDC | 52HH | D08 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR BLEED/ENG 1/CTL | 3HA1 | D12 |
| 49VU | AIR BLEED/ENG 1/MONG | 2HA1 | D11 |
| ** ON A/C NOT FOR ALL | |||
| 49VU | AIR BLEED/ENG 2/MONG | 3HA2 | D12 |
| 49VU | AIR BLEED/ENG 1/CTL | 2HA1 | D11 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | IGGS/CTRL | 7YA | N28 |
| ** ON A/C NOT FOR ALL | |||
| 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 |
| ** ON A/C NOT FOR ALL | |||
| 121VU | IGGS/CTRL | 7YA | P28 |
| ** ON A/C NOT FOR ALL | |||
| 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 1/CHAN B/115VAC | 50HH | Y18 |
| 122VU | AIR BLEED/X FEED VALVE/NORM | 1HV | Z20 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR BLEED/ENG 2/CTL | 3HA2 | Z23 |
| 122VU | AIR BLEED/ENG 2/MONG | 2HA2 | Z22 |
| ** ON A/C NOT FOR ALL | |||
| 122VU | AIR BLEED/ENG 1/MONG | 3HA1 | Z23 |
| 122VU | AIR BLEED/ENG 2/CTL | 2HA2 | Z22 |
C. Safety Precautions
(1) Put the WARNING NOTICE(S) in the cockpit to tell persons not to start the APU.
(2) In the cockpit, on AIR COND panel 30VU, make sure that:
(3) On the HP ground connector, put the WARNING NOTICE(S) in position to tell persons not to supply the ground air.
Subtask 21-58-51-010-050-A ** ON A/C NOT FOR ALL (1) Put the WARNING NOTICE(S) in the cockpit to tell persons not to start the APU.
(2) In the cockpit, on AIR COND panel 30VU, make sure that:
- The APU BLEED pushbutton switch is released (the OFF legend is on).
- The ENG 1 BLEED and the ENG 2 BLEED pushbutton switches are released (the OFF legends are on).
(3) On the HP ground connector, put the WARNING NOTICE(S) in position to tell persons not to supply the ground air.
D. Get Access
(1) Put an ACCESS PLATFORM 2M (6 FT) in position at the zone 191.
(2) Remove the access panel 191BB (Ref. AMM TASK 53-35-13-000-002).
4. Procedure(1) Put an ACCESS PLATFORM 2M (6 FT) in position at the zone 191.
(2) Remove the access panel 191BB (Ref. AMM TASK 53-35-13-000-002).
Subtask 21-58-51-020-050-A ** ON A/C NOT FOR ALL
A. Removal of the Isolation Valve
(1) Disconnect the electrical connector (7).
(2) Put a CAP - BLANKING on the disconnected electrical connector (7).
(3) Disconnection of the Bonding Strap
(4) Loosen the clamps (1) and (3) of the ozone converter (2).
(6) Remove the isolation valve (6).
(a) Make sure that the anti-rotation pin at the duct (14) does not damage the surface of the isolation valve (6).
(b) Carefully move the isolation valve (6) away from the flange of the duct (14).
(7) Remove the seals (4) and (13) and discard them.
(8) Put PLUG - BLANKING on the disconnected line ends.
(1) Disconnect the electrical connector (7).
(2) Put a CAP - BLANKING on the disconnected electrical connector (7).
(3) Disconnection of the Bonding Strap
CAUTION:
MAKE SURE THAT THE ELECTRICAL CONNECTOR(S) IS(ARE) DISCONNECTED BEFORE YOU DISCONNECT THE BONDING STRAP(S).
(a) Remove the nut (11), the washers (9), the bonding strap (10) and the screw (8). (4) Loosen the clamps (1) and (3) of the ozone converter (2).
NOTE: This is necessary to get sufficient space to remove the isolation valve (6).
(5) Hold the isolation valve (6) and remove the clamps (5) and (12). (6) Remove the isolation valve (6).
(a) Make sure that the anti-rotation pin at the duct (14) does not damage the surface of the isolation valve (6).
(b) Carefully move the isolation valve (6) away from the flange of the duct (14).
(7) Remove the seals (4) and (13) and discard them.
(8) Put PLUG - BLANKING on the disconnected line ends.