W DOC AIRBUS | TSM A320F

Failure of the Pitot Probes (PHC 1 and PHC 3)

TASK 30-31-00-810-866-A
Failure of the Pitot Probes (PHC 1 and PHC 3)

1. Possible Causes
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 30-31-00-710-001
Operational Test of the Probe Ice Protection
ASM 303101
ASM 303103
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 34-11-15-000-001
Removal of the Pitot Probe
AMM 34-11-15-400-001
Installation of the Pitot Probe
3. Fault Confirmation
Subtask 30-31-00-710-173-A ** ON A/C NOT FOR ALL
A. Test
   (1) Do the operational test of the probe ice protection AMM 30-31-00-710-001.
4. Fault Isolation
Subtask 30-31-00-810-118-B ** ON A/C NOT FOR ALL
A. If the ECAM warning ANTI ICE CAPT+STBY PITOT comes into view and the test gives the maintenance messages PITOT PROBE 9DA1 and PITOT PROBE 9DA3:
  • Disconnect the connector from the PITOT PROBE 1 (9DA1) and do a check of the resistance between pins A/B and A/C ASM 303101.
  • Disconnect the connector from the PITOT PROBE 3 (9DA3) and do a check of the resistance between pins A/B and A/C ASM 303103.
   (1) If the resistance is more than 35.7 ohms (open circuit) or less than 32.3 ohms (short circuit):
     (a) Replace the PROBE-PITOT, 1 [9DA1] and/or the PROBE-PITOT, 3 [9DA3] AMM 34-11-15-000-001 and AMM 34-11-15-400-001.
   (2) If the resistance is between 32.3 ohms and 35.7 ohms:
     (a) Replace the PHC-1 [6DA1] and/or the PHC-3 [6DA3] AMM 30-31-34-000-002 and AMM 30-31-34-400-002.
     (b) If the fault continues:
  • Do a check and repair the wiring :
    . From pin A/H of the PHC 1 (6DA1) to pin A/B of the PITOT PROBE 1 (9DA1) ASM 303101.
    . From pin A/H of the PHC 3 (6DA3) to pin A/B of the PITOT PROBE 3 (9DA3) ASM 303103.
Subtask 30-31-00-810-118-E ** ON A/C NOT FOR ALL
A. If the ECAM warning ANTI ICE CAPT+STBY PITOT comes into view and the test gives the maintenance messages PITOT PROBE 9DA1 and PITOT PROBE 9DA3:
  • Disconnect the connector from the PITOT PROBE 1 (9DA1) and do a check of the resistance between pins A/B and A/C ASM 303101.
  • Disconnect the connector from the PITOT PROBE 3 (9DA3) and do a check of the resistance between pins A/B and A/C ASM 303103.
   (1) If the resistance is more than 34 ohms (open circuit) or less than 24 ohms (short circuit):
     (a) Replace the PROBE-PITOT, 1 [9DA1] and/or the PROBE-PITOT, 3 [9DA3] AMM 34-11-15-000-001 and AMM 34-11-15-400-001.
   (2) If the resistance is between 24 ohms and 34 ohms:
     (a) Replace the PHC-1 [6DA1] and/or the PHC-3 [6DA3] AMM 30-31-34-000-002 and AMM 30-31-34-400-002.
     (b) If the fault continues:
  • Do a check and repair the wiring :
    . From pin A/H of the PHC 1 (6DA1) to pin A/B of the PITOT PROBE 1 (9DA1) ASM 303101.
    . From pin A/H of the PHC 3 (6DA3) to pin A/B of the PITOT PROBE 3 (9DA3) ASM 303103.
Subtask 30-31-00-710-174-A ** ON A/C NOT FOR ALL
B. Do the test given in Para. 3.
[Rev.8 from Aug 2018] 2026.04.04 04:29:39 UTC
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