# SDR ASAA0955078

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 8, 2009
- Submitted: April 13, 2009
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 10,013 hours, 2,934 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: Malfunctioned
- Location: Cabin Temp
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0955078

## Discrepancy

ON MASTER RECALL AFT CABIN ZONE TEMP LIGHT ILLUMINATED, CONFIRMED.  CHECKED, NO HISTORY.  NR 1 TEMP CTRLR SHOWS "TRIM VALVE ZONE" ON BIT TEST ONLY.  PREV FLT & VERIFY TESTS GOOD.  RESET FAULT.   FAULT DID NOT RETURN.  BITE TESTS NR 1 CTRLR GOOD.  REF MM 21 61 00/501.

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