# SDR ASAA2014122010010

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 20, 2014
- Submitted: December 22, 2014
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 18,115 hours, 5,510 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Condition: Malfunctioned
- 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/ASAA2014122010010

## Discrepancy

DURING MASTER CAUTION RECALL, CONTROLLER CABIN ZONE TEMP, AMBER, LIGHT ILLUMINATES.  LIGHT EXTINGUISHES WITH MASTER CAUTION RESET.  ACFT GROUNDED.  NR 2 TEMP CONTROLLER SHOWS "FLT DECK TRIM VALVE" FAULT ON PREV FLT & BIT. VERIFY TEST PASSSES. RESET FAULT. FAULT DID NOT RETURN.  NO HISTORY - 60 DAYS.  BITE TEST NR 2 TEMP CONTROLLER GOOD, REF MM 21-61-00.

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