# SDR ASAA2023062843795

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: June 28, 2023
- Submitted: July 3, 2023
- Operation: Air carrier
- Aircraft: [N533AS](https://openairdocs.org/aircraft/N533AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35201
- Aircraft time: 45,338 hours, 13,115 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989085
- Part serial: 2596
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 77,001 hours, 35,666 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/ASAA2023062843795

## Discrepancy

CONT CAB ZONE TEMP ILLUMINATES WITH RECALL. GROUNDED - YES. REMOVED AND REPLACED TRIM MODULATING VALVE, CONTROL CAB REF B737-800 AMM 21-61-21. OPS CHECK GOOD.

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