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A Boeing 747-400's main landing gear. Note the toes-up bias angle of the bogies on the wing gear, to ensure correct stowage upon retraction: 707, 720, 757, 767, 787: 10 wheels [1x2]+[2x4] A Boeing 757-200 from British Airways: 777: 14 wheels [1x2]+[2x6] A Boeing 777-200 from United Airlines.
The landing gear represents 2.5 to 5% of the maximum takeoff weight (MTOW) and 1.5 to 1.75% of the aircraft cost, but 20% of the airframe direct maintenance cost. A suitably-designed wheel can support 30 t (66,000 lb), tolerate a ground speed of 300 km/h and roll a distance of 500,000 km (310,000 mi) ; it has a 20,000 hours time between overhaul and a 60,000 hours or 20 year life time.
The most common cause of gear-up landings is the pilot simply forgetting to extend the landing gear before touchdown. On any retractable gear aircraft, lowering the landing gear is part of the pilot's landing checklist, which also includes items such as setting the flaps, propeller and mixture controls for landing. Pilots who ritually perform ...
An F-14 Tomcat descends to make an arresting gear landing on the flight deck of USS Theodore Roosevelt (CVN-71) in 2002. An arresting gear, or arrestor gear, is a mechanical system used to rapidly decelerate an aircraft as it lands.
They move the wheels forward of the landing gear leg by 2-3 inches (5–8 cm). [ 1 ] The installation of landing gear extenders is almost always the result of operational experience with an aircraft design that shows a problem with the landing gear – when the brakes are applied heavily the aircraft has a tendency to go up on its nose and ...
The plane, a Beach B-200 Super King, circled the airport for hours burning fuel before making a “textbook” wheels-up emergency landing, CNN affiliate Nine News reported.
Bell XP-39B Airacobra, 38–326, modified from prototype XP-39, on test flight out of Buffalo, New York, suffers failure of main gear legs to retract fully, stopping 18 inches (460 mm) short of flush stowage. Pilot, Wright Field P-39 project officer George Price, saves prototype with deft belly-landing, damage mostly limited to the propeller. [2]
It also focuses on ancillary systems such as steering control, landing gear control and indication, emergency control, brake control, wheels, brakes, tires, door mechanisms and electrical harnesses. This site is the final assembly area where landing gear systems for many aircraft are fully assembled and tested before shipping to the customer.