# SDR ASAA2023012141606

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 21, 2023
- Submitted: January 24, 2023
- Operation: Air carrier
- Aircraft: [N592AS](https://openairdocs.org/aircraft/N592AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35190
- Aircraft time: 53,930 hours, 16,000 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 5715
- Condition: Faulted
- Location: Left Ecs Bay
- Part time: 3,310 hours, 999 cycles
- Stage of operation: NR
- How discovered: V
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2023012141606

## Discrepancy

ZONE TEMP LIGHT CONT CAB ILLUMINATED ON RECALL. GROUNDED - YES. REMOVED & REPLACED LH TRIM AIR VALVE. REF B737-800 AMM 21-61-09.

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