# SDR ASAA2018111326801

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 11, 2018
- Submitted: November 14, 2018
- Operation: Air carrier
- Aircraft: [N431AS](https://openairdocs.org/aircraft/N431AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 43255
- Aircraft time: 20,169 hours, 6,653 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Condition: Faulted
- Location: Zone Temp
- Stage of operation: NR
- 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/ASAA2018111326801

## Discrepancy

AFT ZONE TEMP FAULT LIGHT ON. GROUNDED - YES. FOUND AFT ZONE VALVE FAULT ON LH CONTROLLER PERFORMED BITE PER B737-900 FIM 21-61 TASK 801 NO HISTORY 90 DAYS NO FAULTS NOTED.

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