About : Aircraft Tire

Plane Spotters India | About : Aircraft Tire 

Aircraft tires are designed to withstand extremely heavy loads for short durations. 
The number of tires required for aircraft increases with the weight of the plane (because the weight of the airplane has to be distributed better). 

Aircraft tire tread patterns are designed to facilitate stability in high crosswind conditions, to channel water away to prevent hydroplaning, and for braking effect. Aircraft tires are usually inflated with nitrogen or helium to minimize expansion and contraction from extreme changes in ambient temperature and pressure experienced during flight.[citation needed] Dry nitrogen expands at the same rate as other dry atmospheric gases, but common compressed air sources may contain moisture, which increases the expansion rate with temperature.

Image Courtesy : Mr. Uday Krishna
Tyre of An-124-100
Taken @ Indira Gandhi International Airport (DEL)

Aircraft tires generally operate at high pressures, up to 200 pounds per square inch (14 bar; 1,400 kPa) for airliners, and even higher for business jets. Tests of airline aircraft tires have shown that they are able to sustain pressures of maximum 800 pounds per square inch (55 bar; 5,500 kPa) before bursting.

During the test the tires have to be filled with water, instead of helium or nitrogen, which is the common content of aircraft tires, to prevent the test room being blown apart by the energy when the tire bursts.

Aircraft tires also include heat fuses, designed to melt at a certain temperature. Tires often overheat if maximum braking is applied during an aborted takeoff or an emergency landing.

The fuses provide a safer failure mode that prevents tire explosions by deflating in a controlled manner, thus minimizing damage to aircraft and objects in the surrounding environment.

The requirement that an inert gas, such as nitrogen, be used instead of air for inflation of tires on certain transport category airplanes was prompted by at least three cases in which the oxygen in air-filled tires combined with volatile gases given off by a severely overheated tire and exploded upon reaching autoignition temperature. The use of an inert gas for tire inflation will eliminate the possibility of a tire explosion.
Aircraft Tire Structure

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