SIDE PLATE OF TURBINE DISC

PROBLEM TO BE SOLVED: To hold a side plate of disc on the side of the disc of a disc assembly to suppress an increase in stress and to solve a limiting region of life. SOLUTION: A ring-shaped disc side plate 30 of a rotor disc assembly 14 for a gas turbine engine includes also a rotation prevention means 110 like a circumferential row of a tab 112 which is disposed apart in the circumferential direction extending to the radial direction so that a rotation of the side plate of the disc 30 is prevented against a disc 26. An opening for cooling air or a hole 88 is extended in the axial direction, penetrating a plate web 96. A rotor assembly 118 includes further a disc hub 50 and a ring-shaped rotor disc 26 which is equipped with a disc hub 50 and an extended section of disc shaft 124 which extends from the disc hub toward the front in the axial direction. A disc rim 56 has a sealing plane 58 directed to the front. A rotor blade 20 is attached in the disc rim and extends therefrom outward in the radial direction.