What are the three basic shock absorbers of aircraft landing gear?
Oleo Struts: A piston absorbs the shock during operations. Oil absorbs landing shocks. Air absorbs taxi shocks.
Why is it called an oleo strut?
History and applications Vickers’ oleo strut was first applied to an aeroplane by the French aircraft company Breguet Aviation. The design proved to be viable and was extensively adopted across the aviation industry for fixed undercarriages, becoming simply referred to as an “Oleo unit” or undercarriage leg.
How much impact can a landing gear take?
This strut is the heart of the landing gear; the mechanism can support around 500 metric tons (about 1 million pounds) plus the forces of an aircraft landing.
How does the strut strengthen the landing gear?
Spring Steel Struts These aircraft use strong, flexible materials like steel, aluminum or composites to help absorb the impact of a landing. As your plane touches down, the springs flex upward, dissipating and transferring the impact load to your airframe at rate that (hopefully) doesn’t bend your plane.
What is a landing gear strut?
Landing Gear Struts: How They Work. Landing gear is an integral part of any aircraft, and perhaps the most important part of landing gear is the struts. The struts are the piece of equipment that bears the brunt of the force an aircraft experiences when it touches back down on ground after flight.
How does a main landing gear shock strut absorb landing shocks?
As you land, pressure from the wheels hitting the ground forces hydraulic fluid up through the orifice and into the top, nitrogen filled chamber. And essentially, the kinetic energy of fast moving hydraulic fluid is transferred into thermal energy, and the shock of your touchdown is absorbed.
What are the three types of landing gear?
Landing gear usually comes in three basic wheel arrangements: conventional, tandem and tricycle-type. Beyond this, landing gear is then classified as either fixed or retractable.
What are the different types of landing gear struts?
Shock struts, often called oleo or air/oil struts, use a combination of nitrogen (or sometimes compressed air) and hydraulic fluid to absorb and dissipate shock loads on landing. You can find them on some smaller aircraft, like the Piper Cherokee, but you most often find them on larger aircraft, like business jets and airliners.
Why do you need a strong landing gear?
Of the many components, it is the structural members that support the heavy landing loads and stop the landing gear from collapsing under the aircraft weight. The materials must be strong enough to support heavy takeoff weight when an aircraft has a full load of fuel and the high impact loads on landing.
What was the cause of the landing gear failure?
As the landing gear failure was caused by shear loading of clevis bolt B2, the load at landing supported by this bolt can be estimated. The ultimate shear stress of the bolt can be approximated from the empirical expression [34 ]:
How is the weight of a landing gear estimated?
The landing gear includes all rolling components, struts, and activating mechanisms. The landing gear weight may be estimated as a function of gross weight alone, but the relationship is not linear.