# SDR ASAA2020120433647

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 4, 2020
- Submitted: December 8, 2020
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 47,024 hours, 14,045 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Message
- Condition: False Activation
- Location: Cockpit Temp
- Stage of operation: NR
- How discovered: 9
- Nature of condition: N
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020120433647

## Discrepancy

ON RECALL "CONT CAB ZONE TEMP" MASTER CAUTION.  GROUNDED-YES.  PER B737-800 FIM 21-62 TASK 842 PACK TEMP CONTROL 2 BITE SHOWS FLIGHT DECK TRIM VALVE FAULT, VERIFY PASSES INITIAL EVALUATION.  AFTER RESET, LT AC PACK OPERATES NORMALLY, NO FAULT SET.

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