What happened
A passenger reported that the aircraft's departure proceeded normally, though the flight was characterized by intense shaking. During the climb, the airplane began a slow right-hand turn. The pilot appeared concerned and reached toward the air vent area before moving his right hand to the communications and navigation radio controls, where he appeared to adjust a dial.
Immediately following this adjustment, the pilot gripped the yoke with both hands and turned it approximately 90 degrees to the left. This maneuver caused the airplane to bank to the left and descend, ultimately impacting terrain in an open field located roughly 200 feet beyond the departure end of the runway. Witnesses on the ground noted that the engine sounded as if it were operating normally during the initial departure.
The investigation
Post-accident examination of the aircraft revealed rotational damage on both propeller blades.