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Last updated: 26 January 2021
Datum:Freitag 27 Dezember 1968
Flugzeugtyp:Silhouette image of generic DC91 model; specific model in this crash may look slightly different
McDonnell Douglas DC-9-15
Fluggesellschaft:Ozark Air Lines
Kennzeichen: N974Z
Werknummer: 47034/162
Baujahr: 1967
Triebwerk: 2 Pratt & Whitney JT8D-7
Besatzung:Todesopfer: 0 / Insassen: 4
Fluggäste:Todesopfer: 0 / Insassen: 64
Gesamt:Todesopfer: 0 / Insassen: 68
Sachschaden: Zerstört
Konsequenzen: Written off (damaged beyond repair)
Unfallort:0,3 km (0.2 Meilen) N of Sioux City-Municipal Airport, IA (SUX) (   USA)
Flugphase: Start (TOF)
Betriebsart:Inländischer planmäßiger Passagierflug
Flug von:Sioux City-Municipal Airport, IA (SUX/KSUX), USA
Flug nach:Chicago-O'Hare International Airport, IL (ORD/KORD), USA
Flugnummer: 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

Show all...


photo of DC-9-15-N974Z
accident date: 27-12-1968
type: McDonnell Douglas DC-9-15
registration: N974Z

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).

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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