Preliminary Accident Reports

July 2011 Issue

May 2, 2011, Truckee, Calif., Cessna 421B

At about 1440 Pacific time, the airplane experienced an uncommanded retraction of the right flap while on the downwind leg for landing. The commercial pilot and two medical flight crewmembers were uninjured; the airplane was undamaged. Visual conditions prevailed. About the time the flaps reached their maximum limit, the pilot heard a popping sound, and the airplane simultaneously rolled about 80 degrees to the right. He counteracted with full left aileron, retracted the flaps and applied full engine power.

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