What happened
The pilot reported that the purpose of the flight was to prepare for a Biennial Flight Review (BFR). During the session, he performed a series of maneuvers including slow flight, VOR tracking, steep turns, and unusual attitudes. The pilot stated he had transitioned from a left to a right 15 degree bank turn. Then, while 'trying to maintain a standard rate turn', the airplane collided with trees and terrain.
The investigation
No further mechanical examination details were provided in the source text.
Findings
The primary factor leading to the accident was the pilot's loss of control during maneuvering flight. Contributing factors included the transition between bank angles and the attempt to maintain a standard rate turn.