Incident Description
A pilot stated that he made a normal approach and touchdown. During the roll-out, after the flaps were retracted, a pulling force to the left was noted. The aircraft then swerved off the left side of the runway, collided with a snowbank, and flipped over.
Witness Observation
A witness located in the run-up area for Runway 23 observed the aircraft execute a go-around because it was high and fast. The witness stated that the aircraft "came in again high and fast" just prior to the accident.
Brake Examination
Examination of the brakes indicated no preimpact malfunctions or failures.