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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.
This helps reduce weight and simplifies the aircraft's braking and hydraulic systems. Each tire of a 777-300ER six-wheel main landing gear can carry a load of 59,490 lb (26,980 kg), which is heavier than other wide-bodies such as the 747-400. [152] The aircraft has triple redundant hydraulic systems with only one system required for landing. [153]
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.
After WWII, aircraft landing gear became Menasco's main product. ... Gear sets for Boeing include the 707, 727, 737, 757, 777 and the KC-135. Gear sets were also made ...
It observed that the main attachment point for the main landing gear was the rear spar of the aircraft's wing; because this spar also formed the rear wall of the main fuel tanks, the crash landing caused the tanks to rupture. The report recommended that Boeing redesign the landing gear attachment to reduce the likelihood of fuel loss in similar ...
2013 : Héroux-Devtek Inc. signs a long-term contract with The Boeing Company to supply complete landing gear systems for the Boeing 777 and 777X programs. 2014 : APPH, an integrated provider of landing gear and hydraulic systems and assemblies for original equipment manufacturer and aftermarket applications is acquired by Héroux-Devtek.
Aircraft tires generally operate at high pressures, up to 200 psi (14 bar; 1,400 kPa) for airliners, [2] and even higher for business jets [citation needed].The main landing gear on the Concorde was typically inflated to 232 psi (16.0 bar), whilst its tail bumper gear tires were as high as 294 psi (20.3 bar). [3]
The tail cone and empennage of the 777 impacted the bulkhead seawall and departed the airplane and the main landing gear sheared off instantly. — United Flight 885 first officer, "Inside United Flight 885: A Pilot's Gripping Account", Chicago Business Journal [ 78 ]