# SDR ASAA2019070829974

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 2019
- Submitted: July 10, 2019
- Operation: Air carrier
- Aircraft: [N464AS](https://openairdocs.org/aircraft/N464AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 40714
- Aircraft time: 20,902 hours, 6,710 cycles
- System (JASC): [2161 · Cabin Temperature Controller](https://openairdocs.org/jasc/2161)
- Part: Controller
- Condition: Faulted
- Location: Cabin 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/ASAA2019070829974

## Discrepancy

AFTER ENG START UPON MASTER CAUTION RECALL TEST, GOT A AMBER MASTER CAUTION LIGHT FOR FWD CAB ZONE TEMP WHICH CLEARED ON MASTER CAUTION RESET. GROUNDED - YES. ACCOMPLISHED PACK TEMP CONTROL BITE PROCEDURE PER FIM 21-62 TASK 801. FOUND ZONE TRIM VALVE CONTROLLER 2 FAULT.

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