Primary finding
Probable cause
The flight's encounter with unforecast clear air turbulence.
Investigator assessment
Analysis narrative
The pilot was while flying at 10,500 feet msl above the overcast over a mountainous area. The flight encountered severe clear air turbulence causing the aircraft to enter into an uncontrolled roll. When the pilot regained control of the aircraft it had entered the clouds. Before the pilot could effect a total recovery the aircraft collided with the trees at the crest of the mountain. The accident site elevation is 9,277 feet msl.
Source record
Factual narrative
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