# SDR ASAA2019112081376

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 18, 2019
- Submitted: November 21, 2019
- Operation: Air carrier
- Aircraft: [N435AS](https://openairdocs.org/aircraft/N435AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43292
- Aircraft time: 24,109 hours, 7,771 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Warning Light
- Condition: False Activation
- Location: Cockpit 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/ASAA2019112081376

## Discrepancy

CONTROL CABIN ZONE TEMP LIGHT ILLUMINATED UPON RECALL. GROUNDED - YES. FOUND FLT DECK TRIM VALVE FAULT ON THE TRIM ZONE CONT. RAN BITE TEST REF B737-900 AMM 21-61-00 SYSTEM OP CHECKS GOOD NO DEFECTS NOTED AT THIS TIME AS PRECAUTION CLEANED FLT DECK FILTER SYSTEM OP CHECKS GOOD THIS CLEARS MEL 21-21G.

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