Narrative:A Delta Air Lines Convair CV-880 (N8807E) taxied across runway 27L in bad weather (250 feet visibility in fog, indefinite ceiling at 200 feet). At the same time, a North Central DC-9 (N954N) took off from runway 27L. Both aircraft collided.
Probable Cause:PROBABLE CAUSE: "The failure of the air traffic control system to ensure separation of aircraft during a period of restricted visibility. This failure included the following: (1) the controller omitted a critical word which made his transmission to the flight crew of the Delta CV-880 ambiguous; (2) the controller did not use all the available information to determine the location of the CV-880; and (3) the CV-880 flight crew did not request clarification of the controller's communications"
» ICAO Circular 132-AN/93 (27-36)
Official accident investigation report
Follow-up / safety actions
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Distance from Chicago-O'Hare International Airport, IL to Madison Regional Airport, WI as the crow flies is 173 km (108 miles).