# SDR ASAA2017070221235

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 2, 2017
- Submitted: July 5, 2017
- Operation: Air carrier
- Aircraft: [N464AS](https://openairdocs.org/aircraft/N464AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40714
- Aircraft time: 12,713 hours, 4,150 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 20993
- Condition: Failed
- Location: Lt A/C Pack
- Part time: 11,307 hours, 3,575 cycles
- Stage of operation: NR
- 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/ASAA2017070221235

## Discrepancy

LEFT PACK LIGHT ILLUMINATED ON RECALL AND EXTINGUISHED WITH MASTER CAUTION RESET.  ACFT GROUNDED.  REMOVED & REPLACED THE LEFT PACK TCV IAW AMM 21-61-21. GROUND VERIFICATION SUCCESSFUL, OPS CHECK NORMAL.

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