Incident Details
On an unspecified date, Northwest Airlines Flight 3, a Boeing 747 registered as N635US, was cleared for takeoff on Runway 14R at Chicago-O'Hare International Airport. Simultaneously, Air Wisconsin Flight 925, a BAE 146 registered as N602AW, was cleared for takeoff on Runway 22L. The two aircraft subsequently passed each other with an estimated separation of 3000 to 4000 feet.
Contributing Factors
According to the investigation, the operational error occurred after the tower supervisor had not assured coordination between the North and South Local Control positions. At the time of the incident, the tower supervisor was acting as both the supervisor and the tower cab coordinator.
Aircraft and Operator Information
Northwest Airlines operated the Boeing 747 (N635US) on Flight 3. Air Wisconsin operated the BAE 146 (N602AW) on Flight 925. Both aircraft were cleared for takeoff at the same time on intersecting runways.