# SDR ASAA2015051911782

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: May 19, 2015
- Submitted: May 21, 2015
- Operation: Air carrier
- Aircraft: [N516AS](https://openairdocs.org/aircraft/N516AS), registered now
- Make and model: Boeing 737890
- Aircraft serial: 39044
- Aircraft time: 24,403 hours, 7,524 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Valve
- Part number: 3989083
- Part serial: 11169
- Condition: Malfunctioned
- Location: A/C Bay
- Part time: 24,409 hours, 7,527 cycles
- 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/ASAA2015051911782

## Discrepancy

ON RECALL, GOT FWD CAB ZONE TEMP LIGHT.  EXTINGUISHES WITH MASTER CAUTION RESET. TEMPS NORMAL.  ACFT GROUNDED.  PERFORMED ZONE TEMP CONTROLLER BITE ON BOTH CONTROLLERS IAW FIM 21-62, TASK 801, FOUND NR 2 CONTROLLER ZONE TRIM VALVE FAULT. REPLACED FWD CAB ZONE TRIM VALVE IAW AMM 21-62-01.

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