# SDR ASAA2019103031211

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: October 30, 2019
- Submitted: November 5, 2019
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 44,950 hours, 13,525 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning System
- Condition: False Activation
- Location: Cockpit
- Stage of operation: CL
- 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/ASAA2019103031211

## Discrepancy

JUST AFTER TAKEOFF OAK, THE "CONTROL CABIN ZONE TEMP" LIGHT ILLUMINATED, QRH FOLLOWED, LIGHT EXTINGUISHED AFTER MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED BITE TEST REF B737-800 FIM 21-62 TASK 801. FOUND TRIM VALVE FLT DECK FAULT LIGHT ON. IN HISTORY. CLEARS AFTER RESET, NO FURTHER DEFECT NOTED OK FOR SERVICE. THIS CLEARS MEL 21-21G.

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