# SDR ASAA0852506

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: January 28, 2008
- Submitted: January 29, 2008
- Operation: Air carrier
- Aircraft: [N570AS](https://openairdocs.org/aircraft/N570AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35185
- Aircraft time: 3,691 hours, 1,095 cycles
- System (JASC): [2161 · Cabin Temperature Controller](https://openairdocs.org/jasc/2161)
- Part: Modulating Valve
- Part number: 3989083
- Condition: Faulty
- Location: Cabin Temp
- Stage of operation: NR
- 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/ASAA0852506

## Discrepancy

THE "ZONE TEMP" LIGHT ILLUMINATED ON RECALL EXTINGUISHED ON MASTER CAUTION RESET.  REPLACED TRIM AIR MOD VALVE IAW 21 61 21.  OPS NORMAL, NO LIGHTS ON RECALL.

---
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.