DOC AIRBUS | TSM A320FPack 2 Flow Sensor Fault
TASK 21-51-00-810-806-A
Pack 2 Flow Sensor Fault
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 21-51-00-710-060-A 4. Fault Isolation
Subtask 21-51-00-810-059-A ** ON A/C NOT FOR ALL
Subtask 21-51-00-860-055-A
[Rev.8 from Aug 2018]
2026.04.04 04:24:46 UTC
Pack 2 Flow Sensor Fault
1. Possible Causes
- P2 FLOW SENSOR [9HB]
- P2 CONTROLLER [27HH]
- wiring
- pressure sense line
- P2 FLOW CTL VALVE [8HB]
- SENSOR-DELTA P, PACK 2 [24HB2]
- CONT-AIR COND SYSTEM 2 [57HH]
- FLOW CTL UNIT - PACK 2 [24HB]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| ASM 215101 | |
| 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 21-51-00-710-060-A 4. Fault Isolation
Subtask 21-51-00-810-059-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message P2 FLOW SENSOR:
Subtask 21-51-00-810-059-C ** ON A/C NOT FOR ALL - replace the P2 FLOW SENSOR [9HB] AMM 21-51-11-000-001 and AMM 21-51-11-400-001.
- replace the P2 CONTROLLER [27HH] AMM 21-61-34-000-001 and AMM 21-61-34-400-001.
- do a check and repair the wiring if necessary between:
CONNECTOR (7557VC) pin A/A and PC 2 (27HH) connector AB/9C,
CONNECTOR (7557VC) pin A/D and PC 2 (27HH) connector AB/10C,
CONNECTOR (7557VC) pin A/C and PC 2 (27HH) connector AB/10B,
CONNECTOR (7557VC) pin A/B and PC 2 (27HH) connector AB/9D ASM 215101.
- do a check of the pressure sense line between the SENSOR (9HB) and the FCV (8HB) 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 P2 FLOW CTL VALVE [8HB] AMM 21-51-51-000-001 and AMM 21-51-51-400-001.
A. If the test gives the maintenance message,
P2 FLOW SENSOR(24HB2):
Subtask 21-51-00-710-061-A P2 FLOW SENSOR(24HB2):
- replace the SENSOR-DELTA P, PACK 2 [24HB2] AMM 21-51-11-000-001 and AMM 21-51-11-400-001.
- replace the CONT-AIR COND SYSTEM 2 [57HH] AMM 21-61-34-000-002 and AMM 21-61-34-400-002.
- do a check and repair the wiring ASM 215101 from:
- the SENSOR (24HB2) to the ACSC2 (57HH).
- replace the FLOW CTL UNIT - PACK 2 [24HB] 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 21-51-00-860-055-A
A. Put the aircraft back to its initial configuration.