DOC AIRBUS | AMM A320FScheduled Replacement of the Trailing-Edge Probe Filter of the Pack Flow-Control Valve
TASK 21-51-51-600-001-A
Scheduled Replacement of the Trailing-Edge Probe Filter of the Pack Flow-Control Valve
1. Reason for the Job
To replace a contaminated trailing-edge probe filter of the pack flow-control valve.
For recommendations as to the intervals refer to Liebherr SB 751-21-01.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
B. Referenced Information
3. Job Set-up
Subtask 21-51-51-865-058-A
[Rev.10 from 2021]
2026.04.02 06:11:23 UTC
Scheduled Replacement of the Trailing-Edge Probe Filter of the Pack Flow-Control Valve
1. Reason for the Job
To replace a contaminated trailing-edge probe filter of the pack flow-control valve.
NOTE: This procedure is only applicable for the pack flow-control valves that follow:
- The P/N 751F0000-01
- The P/N 751G0000-01.
NOTE: This procedure is not applicable for these pack flow-control valves:
The procedure is the same for the pack flow-control valves 8HB and 11HB. - P/N 751A-Amdt C
- P/N 751B-Amdt B.
The A-and B-type filters can not be replaced on aircraft.
For recommendations as to the intervals refer to Liebherr SB 751-21-01.
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment
| REFERENCE | QTY | DESIGNATION |
|---|---|---|
| No specific | AR | SAFETY CLIP - CIRCUIT BREAKER |
| REFERENCE | DESIGNATION |
|---|---|
| TASK 21-51-00-710-002-A | Operational Test of the Flow Control and Indicating System |
Subtask 21-51-51-865-058-A
A. Open, safety and tag this(these) circuit breaker(s):
4. Procedure| PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 11HB (P1 FLOW CTL VALVE) | |||
| 49VU | AIR COND/FLOW/CTL &/IND1 | 1HB | D07 |
| 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 SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| FOR FIN: 8HB (P2 FLOW CTL VALVE) | |||
| 122VU | AIR COND/FLOW/CTL AND IND/2 | 2HB | V21 |
| 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 SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
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.
Subtask 21-51-51-865-059-A A. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):
Subtask 21-51-51-710-051-A | PANEL | DESIGNATION | FIN | LOCATION |
|---|---|---|---|
| ** ON A/C NOT FOR ALL | |||
| FOR FIN: 11HB (P1 FLOW CTL VALVE) | |||
| 49VU | AIR COND/FLOW/CTL &/IND1 | 1HB | D07 |
| 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 SYS2/1/28VDC | 4HH | Y19 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/1/115VAC | 2HH | Y18 |
| FOR FIN: 8HB (P2 FLOW CTL VALVE) | |||
| 122VU | AIR COND/FLOW/CTL AND IND/2 | 2HB | V21 |
| 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 SYS2/2/28VDC | 24HH | Y21 |
| 122VU | AIR COND/PACK TEMP CTL SYS2/2/115VAC | 22HH | Y20 |
B. Test and Check
(1) Do the operational test of the flow control and indicating system (Ref. AMM TASK 21-51-00-710-002).
(2) Leak Check
(1) Do the operational test of the flow control and indicating system (Ref. AMM TASK 21-51-00-710-002).
(2) Leak Check
WARNING:
PUT ON PROTECTIVE GOGGLES AND THERMAL GLOVES WHEN YOU GO NEAR AN AIR-CONDITIONING PACK WHEN IT OPERATES. THERE CAN BE LEAKAGE OF HOT AIR, WHICH CAN CAUSE INJURIES.
(a) During the operational test, do a check for leaks at the filter installation. NOTE: Leaks are not permitted.