What happened
During the descent phase between 8,000 and 6,000 feet, the aircraft accumulated a layer of rime ice measuring approximately 0.5 to 0.75 inches. By the time the aircraft reached the approach phase, most of this ice had cleared from the wing leading edges, though some trace amounts remained on the rear of the deice boots. While on final approach for runway 2D, the pilot operated at an indicated airspeed of roughly 121 knots with 30 degrees of flaps selected, managing the centerline using differential engine power to counteract gusting winds.
As the aircraft crossed the runway threshold and entered the landing flare, the airspeed decreased toward 92 knots. At this moment, the aircraft experienced an abrupt pitch-up movement and a sudden roll to the left. The pilot attempted to correct the deviation, but the flight control inputs provided very little effectiveness in stabilizing the wings or maintaining altitude and heading. The aircraft drifted off the left side of the runway and began vibrating violently. As the left wing struck the ground, the pilot attempted a go-around by advancing the throttles, but the aircraft cartwheeled and ignited.
Findings
Post-accident investigations revealed that the aircraft's flight control systems and deice control valves were functioning normally prior to the impact. No ice accumulation was observed on the ground along the approach path. The surface winds at the time of the accident were reported at approximately 4 knots from the north-northwest, and the accident resulted in no reported fatalities.