# SDR ASAA2020112933607

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: November 29, 2020
- Submitted: December 1, 2020
- Operation: Air carrier
- Aircraft: [N471AS](https://openairdocs.org/aircraft/N471AS), registered now
- Make and model: Boeing 737990ER
- Aircraft serial: 41703
- Aircraft time: 23,612 hours, 7,538 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Condition: Faulted
- Location: Trim Air
- 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/ASAA2020112933607

## Discrepancy

AFT CABIN ZONE TEMP ON RECALL.  GROUNDED-YES.  PERFORMED B737-900 FIM 21-62 TASK 801.  FOUND AFT ZONE TRIM VALVE FAULT.  PERFORMED FIM 21-62 TASK 835 AND AFT CABIN TRIM AIR VALVE FAULT RESET.  NO FURTHER ACTION NECESSARY.

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