Patent ID: 8413699

Claim:
A radial tire for aircraft comprising a radial carcass toroidally extending between a pair of bead cores and comprised of at least one carcass ply, and a belt disposed on an outer periphery of a crown region of the radial carcass and composed of plural belt layers each containing organic fiber cords, characterized in that a total strength of the belt T belt [N] in a circumferential direction over its full width satisfies T belt /WD≧1.5×10 6 in which D [m] is an outer diameter of the tire and W [m] is a width of the tire; the belt is composed of at least two belt layers each containing organic fiber cords with an elongation in an extension direction under a load of 3.2 cN/dtex of 2.2-9.3%; a protection belt layer having a circumferential stiffness lower than that of the belt is disposed at an outside of the belt in a radial direction; a ratio of the circumferential stiffness of the protection belt layer to the circumferential stiffness of the belt is less than 0.5; the protection belt layer is composed of organic fiber cords having a tensile strength at break of not less than 6.3 cN/dtex and a heat shrinkage factor of 0.5-5.0%; and the protection belt layer is composed of at least one layer and constituted by disposing a great number of organic fiber cords at an angle of 30-60° with respect to an equatorial plane of the tire.