Accident Overview
The airplane was en route to its destination when air traffic control issued a clearance to descend. As the airplane descended to the assigned altitude, radar plots showed it entering a right turn, climbing rapidly, and then descending rapidly in a spiral-like pattern. The wreckage was located the following day in mountainous terrain. Several tall trees surrounded the perimeter of the wreckage, and many displayed scuff marks down their trunks consistent with a near-vertical impact. All components of the airplane were accounted for at the accident site.
Examination Findings
A postaccident examination revealed no preimpact failures of the airframe or the engine. The airplane was intact with no evidence of mechanical malfunction prior to impact.
Weather Conditions
A weather analysis indicated that the airplane was descending in the immediate vicinity of a stationary front. The atmospheric conditions in the area were conducive to the production of moderate to severe turbulence, mountain wave activity with updrafts and downdrafts in excess of 750 feet per minute, and moderate icing. Radar data confirmed that the rapid descent began shortly after the airplane entered cumuliform clouds.
Sequence of Events
The radar information, combined with the wreckage distribution, was consistent with the pilot losing control of the airplane while attempting to maneuver in an area of turbulent weather. The descent trajectory and impact signature align with a loss of control scenario rather than a structural failure or controlled flight into terrain.