W DOC AIRBUS | TSM A320F

FWD Cabin Trim-Air Valve Fault

TASK 21-63-00-810-803-A
FWD Cabin Trim-Air Valve Fault

1. Possible Causes
  • TRIM VALVE FWD CAB [12HK]
  • wiring
  • ZONE CONTROLLER [8HK]
  • CONT-AIR COND SYSTEM 2 [57HH]
2. Job Set-up Information
 A. Referenced Information
REFERENCE
DESIGNATION
AMM 21-61-34-000-002
Removal of the Air-Conditioning System Controller
AMM 21-61-34-400-002
Installation of the Air-Conditioning System Controller
AMM 21-63-00-710-004
Operational Test of the Cockpit and Cabin Temperature Control with CFDS/MCDU
ASM 216302
AMM 21-63-34-000-001
Removal of the Zone Controller
AMM 21-63-34-400-001
Installation of the Zone Controller
AMM 21-63-51-000-001
Removal of the Trim Air Valve
AMM 21-63-51-400-001
Installation of the Trim Air Valve
3. Fault Confirmation
Subtask 21-63-00-710-055-A ** ON A/C NOT FOR ALL
A. Confirmation of the Fault
   (1) 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.
   (2) Do a read out of the POST FLIGHT REPORT and the PREVIOUS LEG REPORT.
Subtask 21-63-00-710-055-B ** ON A/C NOT FOR ALL
A. Confirmation of the Fault
   (1) Do the operational test of the cockpit and cabin temperature-control system with CFDS/MCDU AMM 21-63-00-710-004.
   (2) Do a read out of the POST FLIGHT REPORT and the PREVIOUS LEG REPORT.
4. Fault Isolation
Subtask 21-63-00-810-101-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message TEST OK, and the POST FLIGHT REPORT and the PREVIOUS LEG REPORT give the maintenance message TRIM VALVE FWD CAB:
Subtask 21-63-00-810-057-A ** ON A/C NOT FOR ALL
B. If the test gives the maintenance message TRIM VALVE FWD CAB:
   (1) If the fault continues:
     (a) This wiring check is only applicable for Trim Air Valves previous to P/N 1320A0000-01 or 963B0000-01 or 750B0000-01.
  • do a check and repair the wiring ASM 216302 from:
  • the TRIM VALVE,FWD CABIN (12HK) to the ZC (8HK) and,
  • the TRIM VALVE,FWD CABIN (12HK) to ground.
     (b) This wiring check is only applicable for Trim Air Valves P/N 1320A0000-01 or 963B0000-01 or 750B0000-01 and subsequent.
  • do a check and repair the wiring ASM 216302 between:
  • the TRIM VALVE,FWD CABIN (12HK) connector A/U and ZC (8HK) connector AB/11A,
  • the TRIM VALVE,FWD CABIN (12HK) connector A/J and ZC (8HK) connector AB/10A,
  • the TRIM VALVE,FWD CABIN (12HK) connector A/K and ZC (8HK) connector AB/10B,
  • the TRIM VALVE,FWD CABIN (12HK) connector A/L and ZC (8HK) connector AB/11B,
  • the TRIM VALVE,FWD CABIN (12HK) connector A/C and ZC (8HK) connector AB/6C,
  • the TRIM VALVE,FWD CABIN (12HK) connector A/E and ZC (8HK) connector AB/6B,
  • the TRIM VALVE,FWD CABIN (12HK) to ground.
Subtask 21-63-00-810-105-A ** ON A/C NOT FOR ALL
C. If the test gives the maintenance message TEST OK, but the FWD cabin trim-air valve symbol on the ECAM COND page is replaced by amber XX:
Subtask 21-63-00-810-101-B ** ON A/C NOT FOR ALL
D. If the test gives the maintenance message TEST OK, and the POST FLIGHT REPORT and the PREVIOUS LEG REPORT give the maintenance message TRIM AIR VALVE FWD CAB(12HK):
Subtask 21-63-00-810-057-B ** ON A/C NOT FOR ALL
E. If the test gives the maintenance message TRIM AIR VALVE FWD CAB(12HK):
   (1) If the fault continues:
  • do a check and repair the wiring ASM 216302 from:
  • the TRIM AIR VALVE (12HK) to the ACSC2 (57HH) and,
  • the TRIM AIR VALVE (12HK) to ground.
Subtask 21-63-00-810-105-B ** ON A/C NOT FOR ALL
F. If the test gives the maintenance message TEST OK, but the FWD cabin trim-air valve symbol on the ECAM COND page is replaced by amber XX:
Subtask 21-63-00-710-056-A
G. Do the test as given in the Para. 3.A.
5. Close-up
Subtask 21-63-00-860-052-A
A. Put the aircraft back to its initial configuration.
[Rev.8 from Aug 2018] 2026.04.04 04:25:00 UTC
"WTRUIB" 2025