# SDR ASAA11510847

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 24, 2011
- Submitted: December 27, 2011
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 21,150 hours, 6,218 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Condition: Malfunctioned
- Location: Ac Bay
- Stage of operation: CL
- 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/ASAA11510847

## Discrepancy

ZONE TEMP LIGHT ILLUMINATED AFTER T/O.  LIGHT EXTINGUISHES WITH MASTER CAUTION RESET.  BITE SHOWS FLT DK ZONE VALVE.  RESET AND REVERIFIED FAULT DID NOT RETURN.

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