DOC AIRBUS | TSM A320FPack 1 Flow Sensor Fault
TASK 21-51-00-810-805-A
Pack 1 Flow Sensor Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-51-00-710-058-A 4. Fault Isolation
Subtask 21-51-00-810-058-A ** ON A/C NOT FOR ALL
Subtask 21-51-00-860-054-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:46 UTC
Pack 1 Flow Sensor Fault
1. Possible Causes
- P1 FLOW SENSOR [10HB]
- P1 CONTROLLER [7HH]
- wiring
- pressure sense line
- P1 FLOW CTL VALVE [11HB]
- SENSOR-DELTA P, PACK 1 [23HB2]
- CONT-AIR COND SYSTEM 1 [47HH]
- FLOW CTL UNIT - PACK 1 [23HB]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 215101 | |
| ASM 215102 | |
| AMM 21-51-11-000-001 | Removal of the Differential Pressure Sensor |
| AMM 21-51-11-400-001 | Installation of the Differential Pressure Sensor |
| AMM 21-51-51-000-001 | Removal of the Pack Flow-Control Valve/ Pack Flow-Control Unit |
| AMM 21-51-51-400-001 | Installation of the Pack Flow-Control Valve/ Pack Flow-Control Unit |
| AMM 21-61-00-710-001 | Operational Test of the Pack Temperature-Control System |
| AMM 21-61-34-000-001 | Removal of the Pack Controller |
| AMM 21-61-34-000-002 | Removal of the Air-Conditioning System Controller |
| AMM 21-61-34-400-001 | Installation of the Pack Controller |
| AMM 21-61-34-400-002 | Installation of the Air-Conditioning System Controller |
Subtask 21-51-00-710-058-A 4. Fault Isolation
Subtask 21-51-00-810-058-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message P1 FLOW SENSOR:
Subtask 21-51-00-810-058-C ** ON A/C NOT FOR ALL - replace the P1 FLOW SENSOR [10HB] AMM 21-51-11-000-001 and AMM 21-51-11-400-001.
- replace the P1 CONTROLLER [7HH] AMM 21-61-34-000-001 and AMM 21-61-34-400-001.
- do a check and repair the wiring if necessary between:
CONNECTOR (7558VC) pin A/A and PC 1 (7HH) connector AB/9C,
CONNECTOR (7558VC) pin A/D and PC 1 (7HH) connector AB/10C,
CONNECTOR (7558VC) pin A/C and PC 1 (7HH) connector AB/10B,
CONNECTOR (7558VC) pin A/B and PC 1 (7HH) connector AB/9D ASM 215101.
- do a check of the pressure sense line between the SENSOR (10HB) and the FCV (11HB) for leaks.
- if leaks are found, tighten the connection or repair the line AMM 21-51-11-000-001, AMM 21-51-11-400-001, AMM 21-51-51-000-001 and AMM 21-51-51-400-001.
- replace the P1 FLOW CTL VALVE [11HB] AMM 21-51-51-000-001 and AMM 21-51-51-400-001.
A. If the test gives the maintenance message,
P1 FLOW SENSOR(23HB2):
Subtask 21-51-00-710-059-A P1 FLOW SENSOR(23HB2):
- replace the SENSOR-DELTA P, PACK 1 [23HB2] AMM 21-51-11-000-001 and AMM 21-51-11-400-001.
- replace the CONT-AIR COND SYSTEM 1 [47HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.
- do a check and repair the wiring ASM 215102 from:
- the SENSOR (23HB2) to the ACSC1 (47HH).
- replace the FLOW CTL UNIT - PACK 1 [23HB] :
- FLOW CTL UNIT - PACK 1 [23HB] AMM 21-51-51-000-001 and AMM 21-51-51-400-001.
B. Do the test as given in the Para. 3.A.
5. Close-upSubtask 21-51-00-860-054-A
A. Put the aircraft back to its initial configuration.