What causes vibration in aircraft?

Aerodynamics, mechanical malfunctions, and external factors such as atmospheric turbulence can cause airplane vibration. Other vibrations are detected by sight, sound, or feel and may depend on flight crew experience for analysis. Normal vibration. Each airplane has a unique signature of normal vibration.

What causes nose wheel shimmy?

An imbalance in the nose tire and wheel assembly can cause a vibration in the nosegear. Uneven tire wear can also cause nose vibrations. An overly inflated nose tire can also contribute to a nosewheel shimmy. A damper that is low on fluid or is excessively worn internally will most assuredly result in a nose shimmy.

What device decreases nose wheel vibration when taxiing taking off or landing?

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.

Why does nose landing gear retract forward?

The most common configuration is retracting nose gear forward, because it’s easy to make space for it there leaving more space for the cargo hold.

Why is vibration bad for aircraft?

This vibration can have adverse effects on the helicopter’s airframe, increasing structure stresses and, at the least, raising discomfort levels inside the aircraft, which can accelerate crew fatigue.

How do I stop my nose wheel shimmy?

The key to avoiding shimmy problems is to prevent them from starting in the first place.

1. First, look for any un-dampered nose gear movement. This is motion of the nose tire without the shimmy damper moving.
2. Next, remove the shimmy damper attachments.
3. Nose gear rigging is also important to prevent shimmy.

What is a 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.

What is torque link?

What is the purpose of shimmy damper?

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.

How is landing gear retracted?

Landing Gear Systems An electrical landing gear retraction system utilizes an electrically-driven motor for gear operation. The system is basically an electrically-driven jack for raising and lowering the gear. If the switch is moved to the DOWN position, the motor reverses and the gear moves down and locks.

What controls the brake system of nose landing?

The main landing gear brakes are controlled by the commander or pilot applying toe pressure to the rudder pedals; electrical signals produced by rudder pedal toe pressure control hydraulic servovalves at each wheel and allow hydraulic system pressure to perform braking.