# SDR ASAA0854106

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 27, 2008
- Submitted: December 29, 2008
- Operation: Air carrier
- Aircraft: [N579AS](https://openairdocs.org/aircraft/N579AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35187
- Aircraft time: 7,162 hours, 2,130 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 4533
- Condition: Inoperative
- Location: Lt Pack
- Part time: 22,861 hours, 9,808 cycles
- Stage of operation: TX
- 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/ASAA0854106

## Discrepancy

ON RECALL "AIR CONDITIONING" MASTER CAUTION ILLUMINATES "PACK" LIGHT ILLUMINATES.  RESETTING MASTER CAUTION CANCELS ALL LIGHTS LT PACK. GROUNDED YES.  REPLACED LT PACK ZONE TEMP CONTROL VALVE P/N 398908 3 VERIFIED WITH SEAMC ED ETOPS COMPATIBLE PART.  ALL BIT AND OPS CHECKS C/W PER BMM 21-51-10.

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