| 摘要 |
PROBLEM TO BE SOLVED: To provide a pneumatic radial tire for an aircraft capable of suppressing untwisting of a carcass cord and permanent set of heel rubber and improving durability of a bead part. SOLUTION: In this pneumatic radial tire for the aircraft in which bead filler 5 made of rubber is arranged on an outer peripheral side of a bead core 4, carcass layers 2 and 3 are mounted around the bead core 4 and the heel rubber 7 is inserted between the carcass layers 2 and 3 and rim cushion rubber 6, an upper end of the bead filler 5 is arranged on the bead core 4 side of a segment L1 crossing the bead part 1 at an angle of 45 deg. in a tire shaft direction from a center of a circular arc of a rim flange F abutted with the bead part 1, a material value of the bead filler 5 is made 9.0 to 13.0 MPa in 100% modulus, a gauge t1 of the heel rubber 7 is made 0.6 to 0.8 times of a carcass gauge t2 in a rim contact part at the time of load, and a material value of the heel rubber 7 is made 4.0 to 8.0 MPa in 100% modulus.
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