# SDR ASAA0852590

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 16, 2008
- Submitted: February 20, 2008
- Operation: Air carrier
- Aircraft: [N558AS](https://openairdocs.org/aircraft/N558AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35177
- Aircraft time: 6,206 hours, 1,761 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Modulating Valve
- Part number: 3989083
- Condition: Faulty
- Location: A/C Bay
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: K
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA0852590

## Discrepancy

AFTER ENGINE START DURING RECALL GOT A "CNTL CAB ZONE TEMP" LIGHT.  FOUND CNTL CAB ZONE TRIM MOD VALVE FAULT LOGGED ON NR 1 TEMP CONTROLLER.  REPLACED CONTROL CABIN TRIM MOD VALVE.  GROUND BITE TEST OK.

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.