What happened
A cross-country flight ended in a fatal accident when the aircraft struck steep, sloping terrain, resulting in a post-impact fire and the fragmentation of the airframe. Radar data indicated that the flight proceeded on a steady course toward the northeast for approximately 32 minutes. Toward the conclusion of the tracked flight path, the aircraft entered an increasingly tight, spiraling left turn near the crash site.
An inspection of the wreckage showed no signs of mechanical failure or malfunctions that would have prevented the aircraft from operating normally. Specifically, the vacuum-powered rotor and housing of the attitude indicator showed rotational scoring, confirming that the instrument's vacuum system was functioning at the time of the event.
Findings
Investigators determined that the pilot likely encountered mountain wave activity and severe turbulence, which led to a loss of control and the subsequent impact with the ground. Local weather stations reported wind gusts reaching 47 knots in the vicinity during the period of the accident. The pilot's failure to secure a preflight weather briefing was a significant factor, as such information would have identified the hazardous wind and turbulence conditions.
Additionally, toxicology results from the pilot's lung and muscle tissue revealed the presence of several substances that can impair physical and mental performance. While the pilot was using medications and managing health conditions that could affect decision-making, the lack of available blood samples prevented investigators from determining if the specific concentrations of these substances reached a level of impairment that compromised flight safety.