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Status:	Final
Date:	20 DEC 1972
Time:	18:00 CST
Type:	McDonnell Douglas DC-9-31
Operator:	North Central Airlines
Registration:	N954N
C/n / msn:	47159/231
First flight:	1968
Total airframe hrs:	11812
Engines:	2 Pratt & Whitney JT8D-7
Crew:	Fatalities: 0 / Occupants: 4
Passengers:	Fatalities: 10 / Occupants: 41
Total:	Fatalities: 10 / Occupants: 45
Airplane damage:	Written off
Airplane fate:	Written off (damaged beyond repair)
Location:	Chicago-O'Hare International Airport, IL (ORD) (United States of America)
Phase:	Takeoff (TOF)
Nature:	Domestic Scheduled Passenger
Departure airport:	Chicago-O'Hare International Airport, IL (ORD/KORD), United States of America
Destination airport:	Madison Regional Airport, WI (MSN/KMSN), United States of America
Flightnumber:	575

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"

Sources:
» ICAO Circular 132-AN/93 (27-36)
» NTSB/AAR-73/15

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last updated 20 November 2009