Incident Description
The pilot reported that upon crossing the runway threshold and selecting 25 degrees of flaps, the airplane pitched down. The pilot immediately released the flaps and added power, but stated that the airplane was basically uncontrollable at that point. Subsequently, the pilot reduced power and lowered the flaps before the airplane struck the runway. The airplane impacted the runway on the centerline and slid approximately 1,000 feet before coming to a stop.
Wreckage Examination
Examination of the wreckage revealed heavy impact damage to the forward fuselage, engines, and wings.
Icing Observation
Approximately one-half inch of rime ice was observed adhering to the leading edges of the left and right horizontal stabilizers, and along the leading edge of the vertical stabilizer.