W DOC AIRBUS | TSM A320F

Trim-Air Pressure Regulating Valve Fault

TASK 21-63-00-810-805-A
Trim-Air Pressure Regulating Valve Fault

1. Possible Causes
  • TRIM AIR PRESS VALVE [14HK]
  • wiring
  • P/BSW (7HK)
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-63-00-710-004
Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
AMM 21-63-00-920-001
Scheduled Replace/Restore the Trim-Air Pressure-Regulating Valve Filter
ASM 216301
ASM 216303
AMM 21-63-52-000-001
Removal of the Pressure Regulating Valve
AMM 21-63-52-400-001
Installation of the Pressure Regulating Valve
3. Fault Confirmation
Subtask 21-63-00-710-059-A ** ON A/C NOT FOR ALL
A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.
NOTE: If a fault is detected, the ZC gives a fault code for shop maintenance in addition to the related CFDS message(s). For detailed information see the applicable Page Block 301.
Subtask 21-63-00-710-059-B ** ON A/C NOT FOR ALL
A. Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.
4. Fault Isolation
Subtask 21-63-00-810-061-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message TRIM AIR PRESS VALVE:
NOTE: Work step (1) is not applicable for TAPRV P/N 70853A010001.
   (1) replace the trim air pressure-regulating valve filter AMM 21-63-00-920-001.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring ASM 216301 and ASM 216303 from:
  • the VALVE (14HK) to the ZC (8HK),
  • the VALVE (14HK) to ground and,
  • the VALVE (14HK) to the CB (3HK) via the P/BSW (7HK).
   (4) If the fault continues:
  • replace the P/BSW (7HK).
Subtask 21-63-00-810-061-B ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message TRIM AIR PRESS VALVE(14HK):
NOTE: Work step (1) is not applicable for TAPRV P/N 70853A010001.
   (1) replace the trim air pressure-regulating valve filter AMM 21-63-00-920-001.
   (2) If the fault continues:
   (3) If the fault continues:
  • do a check and repair the wiring ASM 216301 and ASM 216303 from:
  • the VALVE (14HK) to the ACSC1 (47HH),
  • the VALVE (14HK) to ground and,
  • the VALVE (14HK) to the CB (58HH) via the P/BSW (7HK).
   (4) If the fault continues:
  • replace the P/BSW (7HK).
Subtask 21-63-00-710-060-A
B. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-63-00-860-054-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:25:00 UTC
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