# SDR ASAA12511393

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 12, 2012
- Submitted: April 16, 2012
- Operation: Air carrier
- Aircraft: [N559AS](https://openairdocs.org/aircraft/N559AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35178
- Aircraft time: 21,141 hours, 6,414 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 5257
- Condition: Malfunctioned
- Location: Ac Bay
- Part time: 36,787 hours, 15,206 cycles
- 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/ASAA12511393

## Discrepancy

UPON MASTER RECALL THE CONT CABIN ZONE TEMP LIGHT ILLUMINATED AND EXTINGUISHED WHEN MASTER CAUTION SYSTEM IS RESET AS PER THE QRH.  REMOVED & REPLACED CONT CABIN ZONE TEMP VLV REF MM 21 61 21 OPS & LEAK CHECK GOOD.

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