What does the shimmy damper do?
What does the shimmy damper do?
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 type of shimmy damper is commonly being used?
Vane-Type. A vane-type shimmy damper is sometime used.
How does a shimmy damper keep a nose wheel from shimmying?
Controlling the urge to shimmy and shake. A shimmy damper uses a cylinder filled with hydraulic fluid or a rubber/lubricant combination to prevent rapid movement of the nosewheel, while not interfering with slower operations.
What is torque link?
Torque Links. The hinged link between the piston and cylinder of an oleo-type landing gear shock absorber. 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.
How does a piston type shimmy damper work?
A piston type shimmy damper is simply a hydrau- lic cylinder containing a piston rod and piston filled with hydraulic fluid. If the movement is slow there will be little resistance from the shimmy damper as the fluid can flow through the orifice to transfer from one chamber to the other.
Which shimmy damper uses a rubber piston?
LORD shimmy damper
The LORD shimmy damper uses surface-effect damping. Essentially, LORD has replaced the metal piston in the traditional damper with a rubber piston that presses out against the inner diameter of the damper housing. This rubber piston then rides on a very thin film of grease.
What is torque link damper?
There is a torque-link damper at the interface of the upper and lower torque-links. The torque-link damper absorbs the vibrations that can occur during landing. It prevents the movement of the landing-gear leg sideways. The side-stay assembly is locked in the down position by a two- piece lock-stay assembly.
How do torque links work?
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.
What does a shimmy damper do for an airplane?
The typical shimmy damper does a good job on minor oscillations but was never intended to stop shimmy from excessively worn parts. Older airplanes typically have the cumulative effect of worn nose gear, steering gear, and tire components.
Can a vane type shimmy damper be used?
A piston-type shimmy damper may contain a fill port to add fluid or it may be a sealed unit. Regardless, the unit should be checked for leaks regularly. To ensure proper operation, a piston-type hydraulic shimmy damper should be filled to capacity. A vane-type shimmy damper is sometime used.
How often should you change the shimmy damper on a Cessna?
Some Cessnas require a specific amount of fluid, and cannot be serviced by just refilling, so always check the maintenance manual for your particular aircraft. Cessna recommends checking the shimmy damper for fluid service at 50-hour intervals.
What kind of steering damper does an aircraft have?
Steering Damper As mentioned above, large aircraft with hydraulic steering hold pressure in the steering cylinders to provide the required damping. This is known as steering damping. Some older transport category aircraft have steering dampers that are vane-type.