Accident
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| Status: | Final |
| Date: | 27 DEC 1968 |
| Time: | 07:11 CST |
| Type: | McDonnell Douglas DC-9-15 |
| Operator: | Ozark Air Lines |
| Registration: | N974Z |
| C/n / msn: | 47034/162 |
| First flight: | 1967 |
| Total airframe hrs: | 3458 |
| Engines: | 2 Pratt & Whitney JT8D-7 |
| Crew: | Fatalities: 0 / Occupants: 4 |
| Passengers: | Fatalities: 0 / Occupants: 64 |
| Total: | Fatalities: 0 / Occupants: 68 |
| Airplane damage: | Written off |
| Airplane fate: | Written off (damaged beyond repair) |
| Location: | Sioux City-Municipal, IA (United States of America) |
| Phase: | Takeoff (TOF) |
| Nature: | Domestic Scheduled Passenger |
| Departure airport: | Sioux City-Municipal Airport, IA (SUX/KSUX), United States of America |
| Chicago-O'Hare International Airport, IL (ORD/KORD), United States of America | |
| Flightnumber: | 982 |
Weather at Sioux City was poor: 800 feet overcast, 3 miles visibility in fog and light freezing drizzle.
Flight 982 took off from runway 35 and, upon gear retraction, rolled violently 90° to the right. The roll was counteracted, but the left wing struck the runway. The DC-9 crashed and came to rest in a grove of trees, 1181 feet past the runway end.
PROBABLE CAUSE: "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 take-off from Sioux City. The Board also finds that the crew selected an improper takeoff thrust for the existing gross weight condition of the aircraft." Sources:
» Airport Operations Vol.19, No.6 (Nov/Dec 1993) / Flight Safety Foundation
» NTSB-AAR-70-20
Official accident investigation report
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