# SDR ASAA2019011527797

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 15, 2019
- Submitted: January 16, 2019
- Operation: Air carrier
- Aircraft: [N457AS](https://openairdocs.org/aircraft/N457AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 36355
- Aircraft time: 19,793 hours, 6,526 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: TX
- 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/ASAA2019011527797

## Discrepancy

ON TAXI OUT AND SELECTING MASTER RECALL THE COCKPIT ZONE TEMP ILLUMINATES. GROUNDED - YES. NR 2 ZONE TEMP CONTROLLER LOGGED "TRIM VALVE" FLT DECK FAIL. PERFORMED ZONE TEMP CONTROLLER BITE TEST REF AMM TASK 21-61-00-700-806-002. RESET FAULT OP'S CHECKED NORMAL.

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