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Last updated: 21 July 2018
Datum:vrijdag 27 december 1968
Type:Silhouette image of generic DC91 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-15
Luchtvaartmaatschappij:Ozark Air Lines
Registratie: N974Z
Constructienummer: 47034/162
Bouwjaar: 1967
Aantal vlieguren:3458
Motoren: 2 Pratt & Whitney JT8D-7
Bemanning:slachtoffers: 0 / inzittenden: 4
Passagiers:slachtoffers: 0 / inzittenden: 64
Totaal:slachtoffers: 0 / inzittenden: 68
Schade: Afgeschreven
Gevolgen: Written off (damaged beyond repair)
Plaats:0,3 km (0.2 mijl) van Sioux City-Municipal Airport, IA (SUX) (   Verenigde Staten)
Fase: Start (TOF)
Soort vlucht:Binnenlandse lijnvlucht
Vliegveld van vertrek:Sioux City-Municipal Airport, IA (SUX/KSUX), Verenigde Staten
Vliegveld van aankomst:Chicago-O'Hare International Airport, IL (ORD/KORD), Verenigde Staten
Vluchtnummer: 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:
Investigating agency: NTSB
Status: Investigation completed
Duration: 1 year and 8 months
Accident number: NTSB/AAR-70-20
Download report: Final report

» Airport Operations Vol.19, No.6 (Nov/Dec 1993) / Flight Safety Foundation
» NTSB-AAR-70-20


NTSB issued 1 Safety Recommendation

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photo of McDonnell Douglas DC-9-15 N974Z
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Deze kaart geeft het vliegveld van vetrek weer en de geplande bestemming van de vlucht. De lijn tussen de vliegvelden geeft niet de exacte vliegroute weer.
De afstand tussen Sioux City-Municipal Airport, IA en Chicago-O'Hare International Airport, IL bedraagt 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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