# SDR ASAA2023022342059

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 23, 2023
- Submitted: February 27, 2023
- Operation: Air carrier
- Aircraft: [N534AS](https://openairdocs.org/aircraft/N534AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35202
- Aircraft time: 44,917 hours, 12,859 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989085
- Part serial: 20258
- Condition: Faulty
- Location: Left Ecs Bay
- Part time: 31,033 hours, 9,672 cycles
- Stage of operation: CL
- 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/ASAA2023022342059

## Discrepancy

CONT ZONE TEMP CAUTION LIGHT ILLUMINATED DURING INITIAL CLIMB PERFORMED QRH LIGHT ILLUMINATED DURING MASTER CAUTION RECALL. GROUNDED - YES. REMOVED AND REPLACED CONTROL ZONE TEMP MODULATING VALVE PER B737-800 AMM 21-61-21/401.

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