# SDR ASAA2022051938428

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2022
- Submitted: May 25, 2022
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 48,932 hours, 14,551 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989086
- Part serial: 35944
- Condition: Inoperative
- Location: Left Ecs Bay
- Part time: 1,431 hours, 389 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/ASAA2022051938428

## Discrepancy

FLIGHT DECK PRIMARY TEMP CONTROLLER INOP. GROUNDED - YES. REMOVE AND REPLACED TRIM MODULATING VALVE FOR CONT CABIN PER B737-800 AMM 21-61-21. OPS CHK GOOD.

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