What is spin up in landing gear?

Abstract. The spin-up and the spring-back are most severe load cases in the aircraft landing gear design. These load cases are caused by reciprocal action of complex physical phenomenon such as the friction between a tire and ground, inertia of the rotation of a tire and the flexibility of a landing gear structure.

Can landing gear retract on ground?

Well, the short answer is no. Modern airplanes have something called “Squat switch”. Essentially it is a sensor, which can tell if a plane is still standing on the ground. When the squat switch is activated, meaning that the plane is still on the ground, it is physically impossible to retract the landing gear.

What are the three basic shock absorbers of aircraft landing gear?

Almost all helicopters use them, in the form of metal skids attached to the frame of the helicopter.

• Spring Steel Struts. One of the most common landing strut systems on general aviation aircraft is the spring steel strut.
• Bungee Cords. Bungee cords are often found on tailwheel and backcountry airplanes.
• Shock Struts.

What does a aileron do on an airplane?

The ailerons are used to bank the aircraft; to cause one wing tip to move up and the other wing tip to move down.

How do landing gears work on a plane?

If you note closely, the landing gears (even the non-retractable ones) are not connected using a simple metal pole; rather, there is an oleo strut which is compressed by the weight of the aircraft. Besides airborne / ground detection, the struts absorb the vertical energy during touchdown.

Why do airplanes have gear bays?

When airborne, to reduce drag, the gear is retracted and folded away into the belly of the aircraft, waiting to be used for landing. However, leaving the retracted gear exposed to the elements would still create a large amount of drag, drastically increasing both fuel usage and noise. To stop this from happening, the gear bays have doors.

How does a plane prevent gear retraction after takeoff?

There is a weight sensor which senses if the plane is on the ground. This sensor prevents gear retraction while the plane is still on the ground. Failure of this sensor would prevent gear retraction after takeoff.

How does the Boeing 787-9 landing gear work?

To improve aircraft performance on the 787-9 and 787-10, one second after the aircraft detects that it is airborne, the main landing gear doors automatically open. This happens even before the pilots select the landing gear lever to the up position.