grove of trees approximately 1,181 feet beyond the departure end of Runway 35." According to the NTSB report, the probable cause was: "A stall near the upper limits of ground effect, with subsequent loss of control as a result of aerodynamic and weight penalties of airfoil icing. The flight crew failed to have the airfoil ice removed prior to the attempted takeoff from Sioux City. The board also finds that the crew selected an improper takeoff thrust for the existing gross weight condition of the aircraft." Anderson Construction Company took 12 hours to salvage and tow the 27.5-ton aircraft to the Air National Guard hangar for further examination by the NTSB. References Ozark Air Lines accidents and incidents Accidents and incidents involving the McDonnell Douglas DC-9