# SDR UALA2011032901508

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 29, 2011
- Submitted: March 31, 2011
- Operation: Air carrier
- Aircraft: [N664UA](https://openairdocs.org/aircraft/N664UA), registered now
- Make and model: Boeing 767322
- Aircraft serial: 29236
- Aircraft time: 45,219 hours, 12,410 cycles
- Engine: Pwa PW4056
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3987865
- Part serial: 341
- Condition: Faulty
- Location: Cabin Temp
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/UALA2011032901508

## Discrepancy

AFT CABIN TRIM VLV INOP LIGHT ON.  CREW TURN SWITCH TO OFF POSITION.  COMPLIED WITH MEL PER PROCEDURE 1.  BITE CABIN TEMP CONTROLLER FAILED AFT TRIM VALVE, RESETTED 2 TIMES AND FAILED VALVE BOTH TIMES.  NEED NEW TRIM VALVE.  REPLACED AFT TRIM VALVE.

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