Landing Gear Flashcards
Describe Oleo Struts.
A typical pneumatic/hydraulic shock strut used nitrogen combined with hydraulic fluid to absorb and dissipate shock loads. It is referred to as an air/oil or OLEO strut. An oleo strut is constructed of two telescoping cylinders or tubes that are closed on the ends. An orifice is located between the two cylinders to allow hydraulic fluid flow from the bottom cylinder to the top cylinder when the strut is compressed. The initial impact from landing is absorbed by hydraulic fluid transferring from one cylinder to the other through a metering orifice. During taxi operations, the tires and the strut combine to absorb shock loads on rough surfaces.
What are the upper and lower cylinders of an oleo strut comprised of? and what are they filled with?
The upper and lower cylinders consist of two chambers. Upper attached to aircraft structure, lower is a piston that slides within the upper. The lower chamber is always filled with hydraulic fluid, and the upper is filled with nitrogen.
What are functions of the metering pin and orifice?
Metering pin controls the fluid flow from the lower chamber into the upper chamber. The orifice is the hole through which a metering pin slides to control fluid flow.
What is and what is the purpose of torque arms/torque links?
Hinged link between the piston and cylinder of oleo-type landing gear shock absorber. Prevents piston rotation and provides wheel alignment. Landing gear symmetry is maintained by the use of torque arms/links.
. What provides a means to slow and steer the aircraft during landing and taxi operations?
Brakes
