# SDR ASAA2021122136972

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 21, 2021
- Submitted: December 23, 2021
- Operation: Air carrier
- Aircraft: [N596AS](https://openairdocs.org/aircraft/N596AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 35688
- Aircraft time: 49,262 hours, 14,661 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Unknown
- Part number: UNKNOWN
- Condition: Unknown
- Location: Unknown
- Stage of operation: NR
- 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/ASAA2021122136972

## Discrepancy

WE HAVE A "AIR COND" CAUTION LIGHT WITH "ZONE TEMP" LIGHT ON OVERHEAD. GROUNDED - YES. PERFORMED BITE TEST ON #2 TEMP. CONTROLLER, TEST SHOWED FLT DECK TRIM VALVE FAULT, RESET CONTROLLER BITE TEST PASS PER B737-800 AMM 21-61-00.

---
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.