# SDR ASAA2017123123036

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 31, 2017
- Submitted: January 2, 2018
- Operation: Air carrier
- Aircraft: [N494AS](https://openairdocs.org/aircraft/N494AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41729
- Aircraft time: 7,567 hours, 2,477 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Control Valve
- Part number: 3989085
- Part serial: 26025
- Condition: Malfunctioned
- Location: Rt A/C Pack
- Part time: 7,576 hours, 2,479 cycles
- Stage of operation: CR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2017123123036

## Discrepancy

RT PACK LIGHT ILLUMINATED ON RECALL PRIOR TO DESCENT,  EXTINGUISHED WITH MASTER CAUTION RESET IAW QRH. ACFT GROUNDED.  REPLACED THE RT PACK TEMP CONTROL VALVE ASSY IAW AMM 21-51-10,  OPS GOOD. BITES GOOD. NO FAULTS FOUND.

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