Flight and Engine Shutdown
The aircraft was being operated for a pre-purchase inspection. During the flight, the right engine was shut off and subsequently could not be restarted.
Single-Engine Landing and Go-Around
Both pilots reported that during the attempted single-engine landing, the wind shifted from a quartering headwind to a quartering tailwind. As a result, the nose and right wing dropped, and the airspeed decreased to Vmc. A single-engine go-around was initiated. However, contrary to the flight manual go-around procedure, the flaps and landing gear were not retracted.
Collision with Trees
Due to the configuration, the aircraft could not climb over a tree located at the departure end of the runway. The airplane struck the tree, then rolled into the dead engine and crashed into surrounding trees in a vertical, nose-down attitude.
Post-Crash Engine Test
The engine was subsequently operated on a test stand.