# SDR ASAA2022120240997

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 2, 2022
- Submitted: December 5, 2022
- Operation: Air carrier
- Aircraft: [N557AS](https://openairdocs.org/aircraft/N557AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35176
- Aircraft time: 60,246 hours, 17,511 cycles
- System (JASC): [2150 · Cabin Cooling System](https://openairdocs.org/jasc/2150)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 30397
- Condition: Faulted
- Location: Lt Acm
- Part time: 11,755 hours, 3,875 cycles
- Stage of operation: NR
- How discovered: 9
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2022120240997

## Discrepancy

ON RECAL ZONE TEMP CONT CAB ILLUMINATED EXTINGUISHES ON RESET. GROUNDED - YES. REPLACED CONTROL CABIN TRIM AIR VALVE OPS CHECK / BITE CHECK GOOD IN REF TO B737-800 AMM 21-61-21.

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