No fatalities

1968-03-21: Boeing 727-100 (N7425U) — United Airlines — Chicago-O'Hare, United States of America

Chicago-O'Hare, United States of AmericaTakeoff (climb)

On March 21, 1968, a Boeing 727-100 (registration N7425U) operated by United Airlines was involved in an aviation accident near Chicago-O'Hare, United States of America during takeoff. No fatalities were reported. Investigators recorded the probable cause as: The failure of the crew to abort the takeoff after being warned of an unsafe takeoff condition. This summary draws on records from the Bureau of Aircraft Accidents Archives (B3A); 10 related events involving the same aircraft type or operator are linked below.

Sourcesthe Bureau of Aircraft Accidents Archives (B3A)Primary reportUpdated 1781238940Data APIEditorial standards
Boeing 727-100
Photo: Pete Macklin / CC BY-SA 2.0, via Wikimedia Commons

A Boeing 727 crashed after takeoff from runway 09R when the crew continued despite a takeoff warning horn. The aircraft overran the runway, struck a ditch, and was destroyed by fire. All three crew members were injured.

Accident Sequence

Shortly after beginning the takeoff roll on runway 09R, the takeoff warning horn sounded. The crew continued the takeoff while attempting to identify the cause of the warning. The horn ceased before the aircraft reached rotation speed. Subsequently, the stick shaker activated, and the flight crew increased thrust. However, the aircraft failed to climb. The captain then elected to discontinue the takeoff. The 727 settled onto the macadam shoulder to the right of the runway, struck a ditch, and came to rest 1,100 feet beyond the departure end of the runway and 300 feet to the right of the extended centerline.

Damage and Injuries

The aircraft was destroyed by a post-crash fire. All three crew members were injured.

Aircraft Configuration

Investigation determined that the flaps were set at 2 degrees, whereas the certified takeoff flap range is 5 to 25 degrees.

Probable Cause

The official finding attributed the accident to the crew's failure to abort the takeoff after being warned of an unsafe takeoff condition.