W DOC AIRBUS | TSM A320F

Failure of the Pitot Probes (PHC 1, PHC 2 and PHC 3)

TASK 30-31-00-810-868-A
Failure of the Pitot Probes (PHC 1, PHC 2 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 303102
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 30-31-00-710-177-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 30-31-00-810-120-B ** ON A/C NOT FOR ALL
A. If the ECAM warning ANTI ICE ALL PITOT comes into view and the test gives the maintenance messages PITOT PROBE 9DA1, PITOT PROBE 9DA2 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 2 (9DA2) and do a check of the resistance between pins A/B and A/C ASM 303102.
  • 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, 2 [9DA2] 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-2 [6DA2] 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 2 (6DA2) to pin A/B of the PITOT PROBE 2 (9DA2) ASM 303102.
    . From pin A/H of the PHC 3 (6DA3) to pin A/B of the PITOT PROBE 3 (9DA3) ASM 303103.
Subtask 30-31-00-810-120-E ** ON A/C NOT FOR ALL
A. If the ECAM warning ANTI ICE ALL PITOT comes into view and the test gives the maintenance messages PITOT PROBE 9DA1, PITOT PROBE 9DA2 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 2 (9DA2) and do a check of the resistance between pins A/B and A/C ASM 303102.
  • 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, 2 [9DA2] 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-2 [6DA2] 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 2 (6DA2) to pin A/B of the PITOT PROBE 2 (9DA2) ASM 303102.
    . From pin A/H of the PHC 3 (6DA3) to pin A/B of the PITOT PROBE 3 (9DA3) ASM 303103.
Subtask 30-31-00-710-178-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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