# SDR Z5FA020511N509CS1

- Type: Service difficulty report (as reported; unverified)
- Difficulty date: February 5, 2011
- Submitted: February 7, 2011
- Operation: Air carrier
- Aircraft: N509CS
- Make and model: Cessna 560XL
- Registry model: [Cessna 560XL](https://openairdocs.org/model/cessna-560xl) (OpenAirDocs)
- Aircraft serial: 5605310
- Aircraft time: 7,266 hours, 5,096 cycles
- System (JASC): [2160 · Cabin Temperature Control System](https://openairdocs.org/jasc/2160)
- Part: Controller
- Condition: Malfunctioned
- Location: Cabin Temp
- Stage of operation: CL
- How discovered: O
- Nature of condition: M, J
- Precautionary procedure: A
- FAA source: FAA Service Difficulty Reporting System (https://sdrs.faa.gov/)
- Page: https://openairdocs.org/sdr/Z5FA020511N509CS1

## Discrepancy

AFTER DEPARTING, CLIMBIMG THRU 4000 FOR 10,000 FT COCKPIT SEEMED WARM, CREW CHECKED DUCT TEMP ON COCKPIT SIDE & IT WAS CLIMBING UNCONTROLLED IN THE AUTO POS. SELECTED MAN/FULL COLD & TEMP KEPT INCREASING.  DUCT O'H ANNUNCIATOR CAME ON & DUCT TEMP HIT 350, &  COULD NOT CONTROL THE TEMP IN MANUAL MODE.  AN EMERGENCY WAS DECLARED & TURNED BACK TO DEPARTURE. CRW COMPLETED COCKPIT DUCT OVER TEMP CHECK LIST. UPON DECENDING INTO VFR CONDITIONS, REGAINED CONTROL OF TEMP IN MANUAL MODE & FINALLY STABILIZED AT 53 DEGREES.  UNDECLARED EMERGENCY AND PROCEEDED BACK TO DESTINATION.  TEMP REMAINED STABLE IN THE MANUAL MODE & FLIGHT COMPLETED WITH OUT INCIDENCE.  MX WORKING WITH THE MFG WAS UNABLE TO DUPLICATE DISCREPANCY.  LT & RT TEMP CONTROLLERS SWAPPED. TEMP CONTROL OPS OK IN AUTO & MANUAL. ACFT RETURNED TO SERVICE.

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