# SDR ASAA12511132

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 21, 2012
- Submitted: February 24, 2012
- Operation: Air carrier
- Aircraft: [N565AS](https://openairdocs.org/aircraft/N565AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35181
- Aircraft time: 20,058 hours, 6,228 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 9102
- Condition: Malfunctioned
- Location: Ac Bay
- Part time: 20,076 hours, 6,237 cycles
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: D
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA12511132

## Discrepancy

LT PACK LIGHT ILLUMINATED ON RECALL AND WOULD NOT RESET.  ACCOMPLISHED FIM TASK 21 62 00 810 801 ZONE TEMP CONTROLLER BITE TEST.  FOUND TCV FAULT ON NR 1 TEMP CONTROLLER. INTERMITTENT FAULT RESET.  PACK OPS NORMAL.  GROUND TEST VERIFIED INTERMITTENT FAULT.  DUE TO HISTORY T/S REQUESTS REPLACE L TCV.  REPLACED LEFT TCV IAW AMM 21 51 10 400 801 OPS CK NORMAL

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