# SDR ASAA2019123071717

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 27, 2019
- Submitted: December 31, 2019
- Operation: Air carrier
- Aircraft: [N479AS](https://openairdocs.org/aircraft/N479AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 60576
- Aircraft time: 18,015 hours, 5,764 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Message
- Condition: False Activation
- Location: Cabin Temp
- Stage of operation: NR
- How discovered: O
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2019123071717

## Discrepancy

HAD ZONE TEMP ON RECALL ENROUTE RAN QRH AND IT WENT OUT. GROUNDED - YES. PERFORMED PACK TEMP CONTROL BITE PROCEDURE PER B737-900 FIM 21-62 TASK 801. HAD FAULT FLT DECK TRIM VALVE ON PREVIOUS FLIGHT. PERFORMED FIM 21-62 TASK 832 AND DURING INITIAL EVALUATION FAULT CLEARED AND NO FURTHER ACTION NECESSARY.

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