DOC AIRBUS | TSM A320FFailure of the Angle of Attack Sensor (PHC 1)
TASK 30-31-00-810-808-A
Failure of the Angle of Attack Sensor (PHC 1)
1. Possible Causes
A. Referenced Information
3. Fault Confirmation
Subtask 30-31-00-710-064-A ** ON A/C NOT FOR ALL
Subtask 30-31-00-810-057-A
[Rev.8 from Aug 2018]
2026.04.04 04:29:34 UTC
Failure of the Angle of Attack Sensor (PHC 1)
1. Possible Causes
- SENSOR-ANGLE OF ATTACK, 1 [3FP1]
- PHC-1 [6DA1]
wiring from the PHC 1 (6DA1) to the angle of attack sensor 1 (3FP1) - wiring
- ADIRU-1 [1FP1]
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 30-31-00-710-001 | Operational Test of the Probe Ice Protection |
| AMM 30-31-00-710-007 | Functional Test of the Heating of the Angle of Attack Sensor |
| AMM 30-31-00-710-802 | Functional Test of the Heating of the Angle of Attack Sensor |
| ASM 303101 | |
| AMM 30-31-34-000-002 | Removal of the Probe Heat Computer (PHC) |
| AMM 30-31-34-400-002 | Installation of the Probe Heat Computer (PHC) |
| AMM 34-11-19-000-001 | Removal of the Angle of Attack Sensor |
| AMM 34-11-19-400-001 | Installation of the Angle of Attack Sensor |
| AMM 34-12-34-000-001 | Removal of the ADIRU |
| AMM 34-12-34-400-001 | Installation of the ADIRU |
| ASM 341302 |
Subtask 30-31-00-710-064-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the functional test of the heating of the angle of attack sensor AMM 30-31-00-710-007.
Subtask 30-31-00-710-064-B ** ON A/C NOT FOR ALL (1) Do the functional test of the heating of the angle of attack sensor AMM 30-31-00-710-007.
A. Test
(1) Do the functional test of the heating of the angle of attack sensor AMM 30-31-00-710-802.
4. Fault Isolation(1) Do the functional test of the heating of the angle of attack sensor AMM 30-31-00-710-802.
Subtask 30-31-00-810-057-A
A. If the measured in-rush current is less than 1.3A during approximately 30 seconds or more than 9A during approximately 10 seconds:
(1) Replace the SENSOR-ANGLE OF ATTACK, 1 [3FP1] AMM 34-11-19-000-001 and AMM 34-11-19-400-001.
Subtask 30-31-00-810-125-A (1) Replace the SENSOR-ANGLE OF ATTACK, 1 [3FP1] AMM 34-11-19-000-001 and AMM 34-11-19-400-001.
B. If none of the results recorded is less than 1.3A or more than 9A:
(1) Replace the PHC-1 [6DA1] AMM 30-31-34-000-002 and AMM 30-31-34-400-002.
(2) If the fault continues:
(a) Disconnect connector A from PHC 1 and remove ADIRU 1 AMM 34-12-34-000-001.
(b) Do a check of the probe signal wiring ASM 341302 between PHC 1 pin A/Z and ADIRU 1 pin AA/3J.
1 If there is no continuity:
Subtask 30-31-00-710-065-A (1) Replace the PHC-1 [6DA1] AMM 30-31-34-000-002 and AMM 30-31-34-400-002.
(2) If the fault continues:
- do a check and repair the
wiring from the PHC 1 (6DA1) to the angle of attack sensor 1 (3FP1) , pin A/F to pin A/<J ASM 303101.
(a) Disconnect connector A from PHC 1 and remove ADIRU 1 AMM 34-12-34-000-001.
(b) Do a check of the probe signal wiring ASM 341302 between PHC 1 pin A/Z and ADIRU 1 pin AA/3J.
1 If there is no continuity:
- Repair the wiring and
- Install ADIRU 1 AMM 34-12-34-400-001.
- Replace ADIRU-1 [1FP1] AMM 34-12-34-400-001.