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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 gear were unlocked and deployed by triple redundant hydraulics, with the gear doors actuated by mechanical linkages to the gear strut. If all three hydraulic systems failed to release the landing gear uplocks within one second of the release command, pyrotechnic charges automatically cut the lock hooks and a set of springs deployed the gear ...
In September 2007, two separate accidents due to similar landing gear failures occurred within three days of each other on Bombardier Dash 8 Q400 aircraft operated by Scandinavian Airlines System (SAS). A third accident, again with a SAS aircraft, occurred in 27 October 2007, leading to the withdrawal of the type from the airline's fleet.
The DC-10 is designed so that if hydraulic pressure to the landing gear is lost, the gear will fall down slightly and rest on the landing gear doors. Placing the regular landing gear handle in the down position will unlock the doors mechanically, and the doors and landing gear will then fall down into place and lock due to gravity. [14] An ...
The main gear are redundant so that landing can be performed on two opposing landing gears if the others are not functioning properly. [111] The 747 also has split control surfaces and was designed with sophisticated triple-slotted flaps that minimize landing speeds and allow the 747 to use standard-length runways. [112]
The hydraulic system is also used to extend and retract landing gear, operate flaps and slats, operate the wheel brakes and steering systems. Hydraulic systems consist of engine driven pumps, fluid reservoirs, oil coolers, valves and actuators. Redundancy for safety is often provided by the use of multiple, isolated systems. [3]
The Avenger ER also has an increased maximum gross takeoff weight (MGTOW) of 19,500 lb (8,800 kg) using a co-cured composite center wing and heavyweight landing gear as well as a dual redundant, light weight brake control capability using a lightweight hybrid linear anti-lock brake system. [36]
Safran Landing Systems. Safran Landing Systems, formerly Messier-Bugatti-Dowty, is the world's largest manufacturer of aircraft landing gear, and is involved in the design, development, manufacture and customer support of all types of aircraft landing gear, wheels and brakes. The company is a wholly owned subsidiary of Safran SA. [6]