# SDR ASAA2023022742136

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 27, 2023
- Submitted: March 3, 2023
- Operation: Air carrier
- Aircraft: [N584AS](https://openairdocs.org/aircraft/N584AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35682
- Aircraft time: 56,237 hours, 16,584 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Part serial: 7178
- Condition: Faulted
- Location: Lt Ecs Bay
- Part time: 63,756 hours, 22,729 cycles
- Stage of operation: IN
- 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/ASAA2023022742136

## Discrepancy

SINGLE CHANNEL FAULT CONTG CAB RESET WITH MASTER CAUTION. GROUNDED - YES. REF B737-800 AMM 21-61-21 REMOVED AND REPLACED LEFT PACK TRIM AIR VALVE.

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