NTSB Factual Report

The pilot reported that two days prior to the accident, snow accumulated on the wings of the airplane while it was in an open front hangar. The day prior to the accident the temperature was warmer and the pilot believed that the snow melted and ran rearward to the aileron gap/hinge locations, re-freezing during the nighttime hours. The day of the accident the pilot said he was in a hurry to use the airplane to check his pastures and brushed the snow off of the wings, but did not perform a thorough preflight check of the airplane and did not check freedom of movement of the ailerons. After takeoff, the airplane began turning to the left. The pilot said that he attempted to correct, but there was no response. When he looked out at the wings, he could see that the ailerons were not responding to control inputs as they should. As he was attempting to regain control, the airplane descended into trees. A postaccident examination of the airplane revealed no defects that were determined to have existed prior to the accident. The airplane sustained substantial damage to both wings, the fuselage and tail surfaces.

NTSB Probable Cause

The pilot's failure to perform an adequate preflight inspection of the airplane and obstruction of the aileron control system by snow and ice, which led to a loss of control during flight.