# SDR ASAA2020110233481

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 2, 2020
- Submitted: November 5, 2020
- Operation: Air carrier
- Aircraft: [N532AS](https://openairdocs.org/aircraft/N532AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 36346
- Aircraft time: 38,261 hours, 11,374 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 27564
- Condition: Inoperative
- Location: Lt A/C Pack
- Part time: 12,211 hours, 3,920 cycles
- Stage of operation: NR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2020110233481

## Discrepancy

CONT CABIN "ZONE TEMP" LIGHT ON RECALL.  GROUNDED-YES.  NR 2 ZONE TEMP CONTROLLER LOGGED FLIGHT DECK TRIM VALVE.  REMOVED AND REPLACED FLIGHT DECK TRIM VALVE, REF B737-800 AMM 21-61-21.  OPERATIONS CHECK NORMAL.

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