NTSB

Probable cause: The pilot’s failure to extend the landing gear before landing.

Probable cause: The pilot’s impaired decision-making due to alcohol intoxication and his improper fuel management, which resulted in a total loss of engine power due to fuel starvation.

Probable cause: The pilot’s decision to continue the night, visual flight into instrument meteorological conditions, which resulted in controlled flight into terrain while on final approach. Contributing to the accident was the pilot’s improper use of

Probable cause: The pilot’s decision to maneuver the aircraft at low altitude, towards rising terrain, which resulted in an inflight collision with trees.

Probable cause: The pilot’s failure to complete the landing checklist and to extend the landing gear before touchdown.

Probable cause: The pilot’s failure to maintain directional control during landing.

Probable cause: The pilot’s failure to identify and correct his construction error of a critical structural component, which resulted in a loss of airplane control during takeoff. Contributing to the accident was the pilot’s impairment due to hi

Probable cause: The pilot’s unstabilized approach and failure to attain the proper touchdown point, which resulted in a runway overrun and collision with a snowbank.

Probable cause: The pilot’s failure to attain a proper touchdown point following a loss of engine power and his inability to stop the airplane on the short, soft runway. Contributing to the accident was the inadequate maintenance of the airplane