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:	0,3 km (0.2 mls) from 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
Destination airport:	Chicago-O'Hare International Airport, IL (ORD/KORD), United States of America
Flightnumber:	982

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."

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