# SDR ASAA2023042843042

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: April 28, 2023
- Submitted: May 1, 2023
- Operation: Air carrier
- Aircraft: [N588AS](https://openairdocs.org/aircraft/N588AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35685
- Aircraft time: 54,689 hours, 16,256 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 28812
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 19,941 hours, 6,430 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/ASAA2023042843042

## Discrepancy

CONT CAB TEMP LIGHT. GROUNDED - YES. R&R CONTROL CABIN ZONE TRIM AIR MODULATING VALVE PER B737-800 AMM 21-61-21/401.

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