Abstract The ATR 72 is the slightly larger variant of the ATR 42, a turboprop-powered commuter aircraft with a wing over fuselage and T tail design. One aircraft of this European designed and built aircraft was being operated by a subsidiary of American Airlines in the Midwest. It was flying between Chicago and several other Indiana, Ohio, and Illinois cities. It encountered significant icing conditions while holding for an opening to land at Chicago’s O’Hare airport. The ice loading exceeded the design operating limit despite the operation of the pneumatic deicing system. The ice produced an unexpected (by the pilot) aileron movement which produced loss of control and loss of the aircraft.


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