Pilot Report
According to the pilot's written statement, she observed slight trace ice while in clouds. She conducted a localizer approach. On short final, the airspeed was noted to be approximately 5 knots below the blue line reference. She then experienced buffet, yaw, and flutter, prompting her to add power. The airplane responded by yawing to the right as power was increased. She executed a go-around. During the go-around, the airplane began bucking and yawing uncontrollably. The pilot responded by lowering the pitch attitude, raising the landing gear, and attempting to retract the flaps. Subsequently, the airplane settled in a snow bank on the south side of the runway.
Passenger Report
The pilot-rated passenger reported that the pilot flared high and overcorrected. He stated that the airplane rocked violently, up to 60 degrees of bank.
Post-Accident Examination
Examination of the airplane revealed no evidence of preimpact mechanical malfunction. Photographs taken after the accident showed a ridge of approximately 1/8 inch of rime ice on the upper portion of the wing and stabilizer leading edges.