NTSB Identification: CHI87IA109.
The docket is stored on NTSB microfiche number 34146.
Scheduled 14 CFR operation of UNITED AIRLINES
Incident occurred Tuesday, April 07, 1987 in CHICAGO, IL
Probable Cause Approval Date: 07/10/1989
Aircraft: BOEING 727-222, registration: N7258U
Injuries: 109 Uninjured.

NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.

A UNITED AIRLINES BOEING 727 DOMESTIC PASSENGER FLIGHT WAS HOLDING SHORT OF RUNWAY 32L AT THE CHICAGO-O'HARE INTERNATIONAL AIRPORT AWAITING CLEARANCE FOR AN INTERSECTION TAKEOFF. A NORTHWEST AIRLINES BOEING 747 INTERNATIONAL PASSENGER FLIGHT WAS HOLDING IN POSITION AT THE END OF THE RUNWAY AWAITING TAKEOFF CLEARANCE. THE CONTROL TOWER CLEARED THE NORTHWEST FLIGHT FOR TAKEOFF AND THE CREW COMMENCED THE TAKEOFF ROLL. THE UNITED FLIGHT THOUGHT THEY HAD BEEN CLEARED FOR TAKEOFF AND TAXIED ONTO THE RUNWAY AND COMMENCE THEIR GROUND ROLL. THE TOWER CONTROLLER NOTED THE INCURSION AND INSTRUCTED THE NORTHWEST FLIGHT TO ABORT THE TAKEOFF. THE UNITED FLIGHT ALSO ABORTED THE TAKEOFF AND BOTH AIRCRAFT TAXIED OFF THE RUNWAY WITHOUT FURTHER INCIDENT.

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

INTERPRETATION OF INSTRUCTIONS..INACCURATE..PILOT IN COMMAND

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