A shimmy damper consists of an oil filled cylinder, with a push–pull rod attached to a disk inside the cylinder. A small hydraulic or pneumatic shock absorber installed between the nose-wheel fork and landing gear structure to prevent or minimize nose-wheel shimmying during takeoff and landing. …

The shimmy damper is a hydraulic fluid-filled cylinder that prevents rapid movement of the nose or main landing gear without interfering with slower operations.

What is landing gear shimmy? It is an oscillation of the landing gear that can occur when the structural vibrations couple with the tyre forces and when this happens, the landing gear will experience a prolonged lateral and torsional motion (think of that annoying trolley wheel at the supermarket!).

The shimmy damper is filled with hydraulic fluid on both sides of the piston. As the collar and the attached damper turn left and right, fluid is forced through the orifice to the opposite side of the piston. This provides a slight resistance to turning, and helps eliminate most of the minor oscillations.

A vane-type shimmy damper is sometime used. [Figure 6] It uses fluid chambers created by the vanes separated by a valve orifice in a center shaft. As the nose gear tries to oscillate, vanes rotate to change the size of internal chambers filled with fluid.

Shimmy is an oscillation in aircraft landing gear that can occur both on landing and take-off, typically in a band of velocities. It causes excessive wear on components and can cause accidents. Shimmy is (or at least includes) oscillation of the wheel assembly about this vertical axis.

The torque links allow the piston to move freely in and out of the landing gear cylinder, but prevent it rotating. The torque links can be adjusted to achieve and maintain the correct wheel alignment. Torque links are also called scissors and nutcrackers.

The single most important and easy action to prevent tire-related events that you can have an impact on is maintaining proper inflation pressure.

Application. Tactair’s Main Landing Gear Retraction Actuators are designed to provide retraction and extension forces while maintaining light weight and reliability. Tactair designed and manufactures retraction actuators for regional jet, business jet as well as smaller aircraft and rotorcraft markets.

When the three gears are fully retracted, pressure builds in the system, and a pressure switch is opened that cuts power to the electric pump motor. The gear are held in the retracted position with hydraulic pressure.

Retractable Landing Gear Disadvantages: Increased weight. Increased cost. Limited to high performance aircraft.

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. Fixed landing gear hangs underneath an aircraft during flight, whereas retractable landing gear is stowed inside an aircraft during flight.

The Boeing 747 has four main landing gears in its center section, as well as its single nose landing gear.

The main reason that the landing gear tilts is simply to allow it to fit best into its storage compartment in the fuselage. Space on an aircraft is precious.

The landing gear is lowered for landing when called out for in the landing checklist and after the airspeed has been lowered to recommended extension speed , another option is to lower the gear when in turbulent air to slow and stabilize the aircraft.

Boeing research shows that takeoff and landing are statistically more dangerous than any other part of a flight. 49% of all fatal accidents happen during the final descent and landing phases of the average flight, while 14% of all fatal accidents happen during takeoff and initial climb.

Question: How do pilots know when to descend to land on the assigned runway at the correct speed? Answer: Pilots plan the descent based on the wind and air traffic flow. Working in partnership with air traffic control, the descent is executed allowing adequate distance to descend and line up with the proper runway.