Accident description
Last updated: 22 October 2014
Status:Final
Date:Wednesday 20 December 1972
Time:18:00
Type:Silhouette image of generic DC93 model; specific model in this crash may look slightly different
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: Damaged beyond repair
Location:Chicago-O'Hare International Airport, IL (ORD) (   United States of America) show on map
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

Official accident investigation report
investigating agency: National Transport Safety Bureau (NTSB) - United States of America
report status: Final
report number: NTSB/AAR-73-15
report released:05-JUL-1973
duration of investigation:197 days (6.6 months)
download report: North Central Airlines, Inc., McDonnell Douglas DC-9-31, N954N and Delta Air Lines, Inc., Convair CV-880, N8807E, O'Hare Intl Arpt. Chicago, IL 12-20-72 (NTSB/AAR-73-15)
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Follow-up / safety actions

NTSB issued 9 Safety Recommendations

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Map
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).

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