Narrative:
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."
Loss of control
» NTSB-AAR-70-20
accident date: 27-12-1968
type: McDonnell Douglas DC-9-15
registration: N974Z
| Status: | Accident investigation report completed and information captured |
| Date: | Friday 27 December 1968 |
| Time: | 07:11 |
| Type: |  McDonnell Douglas DC-9-15 |
| Operator: | Ozark Air Lines |
| Registration: | N974Z |
| 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 |
| Aircraft damage: | Damaged beyond repair |
| Location: | 0,3 km (0.2 mls) N of Sioux City-Municipal Airport, IA (SUX) ( 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:
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."
Accident investigation:
 |
|
Classification:
IcingLoss of control
Sources:
» Airport Operations Vol.19, No.6 (Nov/Dec 1993) / Flight Safety Foundation» NTSB-AAR-70-20
Follow-up / safety actions
NTSB issued 1 Safety Recommendation
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Photos
accident date: 27-12-1968
type: McDonnell Douglas DC-9-15
registration: N974Z
Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Sioux City-Municipal Airport, IA to Chicago-O'Hare International Airport, IL as the crow flies is 695 km (434 miles).
Distance from Sioux City-Municipal Airport, IA to Chicago-O'Hare International Airport, IL as the crow flies is 695 km (434 miles).
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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