# SDR ASAA2016020615295

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 6, 2016
- Submitted: February 8, 2016
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 7,774 hours, 2,556 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989084
- Part serial: 20949
- Condition: Failed
- Location: Cabin Temp
- Part time: 7,770 hours, 2,554 cycles
- 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/ASAA2016020615295

## Discrepancy

AFT ZONE TEMP ON RECALL- QRH FOR ZONE TEMP LED TO QRH FOR CABIN TOO HOT.  ACFT GROUNDED. PERFORMED BITE ON BOTH CONTROLLERS NR 1 FAULTED ZONE TRIM VALVE AND WOULD NOT RESET NR 2 NO FAULTS REF FIM 21-62, TASK 801. R & R ZONE TRIM MOD VALVE OPS.  LEAK CHECK GOOD REF AMM 21-61-21. REACCOMPLISHED BITE CHECK NO FAULTS, CHECKS GOOD NO AFT ZONE TEMP LIGHT ON RECALL.

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