The inadequate and unapproved design of the main landing gear assembly by the manufacturer, which resulted in a failure of the main landing gear during landing, and structural damage to the airplane. A factor in the accident was the pilot's misjudged flare.

the pilot's improper planning/decision, which resulted in his failure (or inability) to maintain clearance from trees after encountering gusty crosswind conditions. The wind condition and close proximity of trees were related factors.