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An oleo strut is a pneumatic air–oil hydraulic shock absorber used on the landing gear of most large aircraft and many smaller ones. [1] This design cushions the impacts of landing and damps out vertical oscillations.
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 wing is supported by "V" struts and jury struts. The aircraft's recommended engine is the 100 hp (75 kW) Rotax 912ULS four-stroke powerplant. The tricycle landing gear is strengthened for rough field operations and includes an adjustable nose strut shock absorber. Electric rudder trim is standard. [1] [3]
A Delta Air Lines flight landed with its “nose landing gear up” at Charlotte Douglas International Airport in North Carolina on Wednesday morning, the FAA says.
The hydraulically retractable landing gear is of conventional tricycle configuration with air-hydraulic shock-type nose and main gear. The main gear has dual wheels and brakes on each strut. The brake system incorporates four power-boosted disc-type brakes with integral anti-skid system.
The first flight, while otherwise uneventful, suffered a partial landing gear failure during landing; while the nose gear collapsed, the twenty-two "millipede wheels" saved the aircraft from damage. The cause was determined to be a stuck oleo strut, which was too short when fully extended, and thus easily rectified via the insertion of a ring. [4]