# SDR ASAA2021042634684

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 26, 2021
- Submitted: April 29, 2021
- Operation: Air carrier
- Aircraft: [N538AS](https://openairdocs.org/aircraft/N538AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 41188
- Aircraft time: 33,729 hours, 9,831 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: 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/ASAA2021042634684

## Discrepancy

AFTER ENGINE START CONT CAB ZONE TEMP ILLUMINATES ON RECALL EXTINGUISHES WITH MASTER CAUTION RESET. GROUNDED - YES. PERFORMED BITE TEST ON BOTH ZONE TEMP COT PER B737-800 FIM 21-61 TASK 801 FOUND TRIM VALVE FLT DECK FAULT ON CONT #2, CLEARED TRIM VALVE FLT DECK FAULT ON #2 CONTROLLER.

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