# SDR WRNA2016F00149

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: July 8, 2016
- Submitted: July 12, 2016
- Operation: Air carrier
- Aircraft: [N903AR](https://openairdocs.org/aircraft/N903AR), registered now
- Make and model: Boeing 747-400
- Registry model: [Boeing 747-400](https://openairdocs.org/model/boeing-747-400) (OpenAirDocs)
- Aircraft serial: 33096
- Aircraft time: 53,520 hours, 7,364 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Part number: 79688150001
- Part serial: 02079516
- Condition: Inoperative
- Location: Cabin Temp
- Stage of operation: CR
- How discovered: O
- Nature of condition: J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/WRNA2016F00149

## Discrepancy

DURING CRUISE, UPPER CABIN AND ALL DECKS TEMPERATURE EXCEEDED 60 DEGREES C.  RETURNED TO DEPARTURE.  EMERGENCY NOT DECLARED.  TROUBLESHOOTING FOUND A DEFECTIVE ZONE TEMPERATURE CONTROLLER.  CONTROLLER WAS REMOVED AND REPLACED, OPERATIONAL SYSTEM CHECK SATISFACTORILY PERFORMED PER AMM 21-61-01 AND 21-61-00, AIRPLANE RETURNED TO SERVICE.

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