# SDR CVGA20161223001

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: December 22, 2016
- Submitted: December 23, 2016
- Operation: Air carrier
- Aircraft: [N655MM](https://openairdocs.org/aircraft/N655MM), registered now
- Make and model: Cessna 680CE
- Aircraft serial: 6800063
- Aircraft time: 7,901 hours, 5,072 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Control Valve
- Part number: 2724128714
- Part serial: 4AR44F
- Condition: Failed
- Location: Cabin Heat
- Stage of operation: CL
- How discovered: O
- Nature of condition: B, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/CVGA20161223001

## Discrepancy

TWO MINUTES AFTER TAKE OFF, RECEIVED AN EICAS AMBER DUCT O'TEMP CABIN LIGHT. REFERRED TO THE QRH EMERGENCY/ ABNORMALS CHECKLIST. AFTER COMPLETING THE CHECKLIST THE DUCT OVERTEMP CABIN LIGHT REMAINED ILLUMINATED AND THE CREW WAS UNABLE TO CONTROL THE CABIN HEAT. THE CABIN WAS EXTREMELY HOT AND A BURNING ODOR WENT THROUGH OUT THE AIRPLANE. DECLARED AN EMERGENCY AND INITIATED A RETURNED TO DEPARTURE AIRPORT. THE CREW LANDED WITHOUT FURTHER INCIDENT AND CONTACTED FLIGHT CONTROL & MAINTENANCE CONTROL.  THE TEMP CONTROL VALVE WAS FOUND TO BE HARD FAILED AND HAS BEEN REPLACED.

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