Why Aircraft tires have a Green Color Spot Around the lower Tire Side wall - what do they mean?Sidewall-Venting!!The Aviation
Aircraft tires Side wall vent-:
In Aviation All Aircraft tires have traditionally been designed to permit any air or nitrogen trapped in the internal cord body, or that diffuses through the innerliner or tube, to escape through designed sidewall vents.these Vent holes exist on both sides of the tire. Not all tires require vent holes due to materials, design and fabrication.
This green spot indicates the location of vents around the tire and shows the venting process was completed.This is particularly true for some physically smaller radial tires used in the General Aviation and high performance.
These vents are tiny holes which are made with a tool called an awl. These holes allow air, which might remain inside the aviation casing after the manufacturing process and which might permeate the aviation tire during operation, to escape.
Types of Color coated in Tires -:
Tires requiring vent holes have them placed in the lower sidewall.The location of each vent hole is indicated by a colored paint dot when required.
◆A Green color is used for tubeless tires.
◆ A White color is used for tube-type tires.
◆Paint dots are applied to new tires.
It is not required that they be refreshed on retreaded tires.