NTSB Identification: CHI00IA248B
Scheduled 14 CFR UNITED AIRLINES
Incident occurred Sunday, August 06, 2000 in CHICAGO, IL
Probable Cause Approval Date: 12/04/2001
Aircraft: Boeing B-747-422, registration: N119UA
Injuries: 363 Uninjured.

NTSB investigators used data provided by various sources and may have traveled in support of this investigation to prepare this aircraft incident report.

An ATR-42 sustained no damage during a near midair collision with a Boeing B-747 after takeoff from runway 22L at the O'Hare International Airport (ORD), Chicago, Illinois. The B-747 had been cleared for takeoff from runway 14R by the south local controller. The ATR-42 was subsequently cleared for takeoff on runway 22L by the third local control position (3LC). When the ATR-42 was rotating, the pilots observed the B-747 that was to their right, and airborne. The ATR-42 leveled off at 100 feet above ground level (agl) and the B-747 flew over the top of the ATR-42 with about 200 feet of vertical separation. Once the B-747 had passed, the ATR-42 resumed the climb and continued en route to it destination. The flightcrew of the B-747 did not observe the ATR-42; nor did they receive an alert from the tower. The B-747 continued en route to its destination. The incident was classified by the air traffic control facility as an operational error. Following the incident, the facility developed new coordination measures between the air traffic controllers in the tower.

The National Transportation Safety Board determines the probable cause(s) of this incident to be:

the improper takeoff clearance issued by the local controller.

Full narrative available

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