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A displaced threshold often exists because of obstacles just before the runway, runway strength, or noise restrictions making the beginning section of runway unsuitable for landings. [30] It is marked with white paint arrows that lead up to the beginning of the landing portion of the runway.
A portion of the runway behind a displaced threshold has three markings: [1] White arrows along the center line of the runway; White arrow heads across the width of the runway just prior to the displaced threshold bar; A 10 feet (3.0 m) wide white threshold bar across the width of the runway at the displaced threshold
The aircraft touched down far past the displaced threshold, leaving the aircraft insufficient runway to stop due to severe icing, and came to a stop in Boston Harbor. Two passengers were never found and are presumed to have drowned. January 13, 1982 78 9 5 Air Florida Flight 90: Potomac River, Washington, D.C. District of Columbia: Boeing 737-200
A McDonnell Douglas DC-10-30 overran a runway at Dallas/Fort Worth International Airport (DFW) after warning signals prompted the flight crew to initiate a rejected takeoff. The jetliner continued to accelerate for several seconds and did not stop until it had run 1,100 feet (335 m) past the runway threshold, collapsing the nose landing gear.
Flight 605 touched down more than 2,100 feet (640 m) past the runway's displaced threshold, at a speed of 150 knots (278 km/h; 173 mph), following an IGS runway 13 approach. Typhoon Ira was generating 20-knot (37 km/h; 23 mph) crosswinds on that runway, gusting to 38 knots (70 km/h; 44 mph), from a heading of 070 degrees.
A runway overrun is a type of excursion where the aircraft is unable to stop before the end of the runway. Runway excursion is the most frequent type of landing accident, slightly ahead of runway incursion. [6] For runway accidents recorded between 1995 and 2007, 96% were of the 'excursion' type. [6]
The accident report stated that the airplane had landed with a 10-knot (19 km/h; 12 mph) tailwind, 400 metres (1,300 ft) from the displaced approach end of the runway. Since this was the first intermediate stop on a long transcontinental flight, the aircraft was near its maximum landing-weight limit (63.5 t vs. 64.5 t maximum allowable).
The DC-10 touched down 2,800 feet (850 m) beyond the displaced threshold. [2] Under normal circumstances, such an incident would have been of minor importance and the plane would have had sufficient space to come to a full stop on the 10,000 feet (3,000 m) long runway .