# SDR ASAA2016040716299

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 7, 2016
- Submitted: April 11, 2016
- Operation: Air carrier
- Aircraft: [N409AS](https://openairdocs.org/aircraft/N409AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41733
- Aircraft time: 12,820 hours, 4,185 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 3989083
- Part serial: 18782
- Condition: Failed
- Location: Temperature
- Part time: 12,828 hours, 4,188 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/ASAA2016040716299

## Discrepancy

UPON RECALL, LT PACK LIGHT ILLUMINATED, FOLLOWED QRH PRESSED MASTER CAUTION TO RESET,  PACK LIGHT EXTINGUISHED.  ACFT GROUNDED.  LT PACK/ZONE TEMP CONTROLLER, M1442  FAULTED, THIS PACK TCV.  REPLACED LT PACK TEMP CONTROL VALVE, V139 ZONE TEMP BITE PASSES. INSTALLATION TEST PASSES, REF AMM 21-51-00/401.

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