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: "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
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 Chicago-O'Hare International Airport, IL to Madison Regional Airport, WI as the crow flies is 173 km (108 miles).