# SDR ASAA2021031234295

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: March 12, 2021
- Submitted: March 16, 2021
- Operation: Air carrier
- Aircraft: [N413AS](https://openairdocs.org/aircraft/N413AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 35205
- Aircraft time: 30,053 hours, 9,624 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Condition: Malfunctioned
- Location: Cockpit Temp
- Stage of operation: TX
- How discovered: O
- Nature of condition: J
- Precautionary procedure: O
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/ASAA2021031234295

## Discrepancy

ON MASTER CAUTION RECALL AFTER ENGINE START, ZONE TEMP ON CONT CABIN ILLUMINATED, AND RESET. GROUNDED - YES. VERIFIED - PERFORMED B737-900 FIM 21-62 TASK 801 TEMP CNTL BITE SHOWS FLT DECK TRIM VALVE FAULT ON BIT AND LAST FLT. PERFORMED FIM 21-62 TASK 832, VERIFY BITE TEST SHOWS GOOD, INITIAL EVALUATION TEST GOOD. INTERMITTENT FAULT. GROUND VERIFICATION CHK GOOD.

---
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.