# SDR ASAA12511395

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 13, 2012
- Submitted: April 16, 2012
- Operation: Air carrier
- Aircraft: [N518AS](https://openairdocs.org/aircraft/N518AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35693
- Aircraft time: 11,965 hours, 3,621 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989083
- Part serial: 6835
- Condition: Malfunctioned
- Location: Ac Bay
- Part time: 27,044 hours, 11,674 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/ASAA12511395

## Discrepancy

LEFT PACK LIGHT ILLUMINATED ON RECALL EXTINGUISHED AFTER PUSHING MASTER CAUTION RESET.  FOUND TCV FAULT IN NR 1 PACK/ZONE TEMP CONTROLLER.  REMOVED & REPLACED LT TCV REF AMM 21 51 10.  OPS & LEAK CHECKED GOOD.

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