Aircraft Accident Report: In-fligt Icing Encounter and Loss of Control Simmons Airlines, d.b.a. American Eagle Flight 4184 Avions de Transport ... N401AM Roselawn, Indiana October 31, 2994

The National Transportation Safety Board determines that the probable causes of this accident were the loss of control, attributed to a sudden and unexpected aileron hinge movement reversal that occurred after a ridge of ice.