# SDR ASAA2013031494173

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 14, 2013
- Submitted: March 18, 2013
- Operation: Air carrier
- Aircraft: [N531AS](https://openairdocs.org/aircraft/N531AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35199
- Aircraft time: 11,257 hours, 3,467 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 2842
- Condition: Faulted
- Location: Lt A/C Pack
- Part time: 46,228 hours, 24,656 cycles
- Stage of operation: TX
- How discovered: V
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2013031494173

## Discrepancy

ON RECALL, MASTER WARNING, A/C - ANNUNCIATOR AND LT LIGHT CAME ON.  ALL EXTINGUISHED UPON RESET.  PERFORMED BITE TEST OF LT PACK ZONE TEMP CONTROLLER  REF AMM 21-61-00-700-806-002.  VERIFIED FAULT, FOUND FAULTED LT PACK TCV.  REPLACED LT PACK TEMP CONTROL VALVE.  OPS AND LEAK CHECKS GOOD NO FAULTS ON BITE TEST AFTER MX.

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