Abstract: Gas turbine rotor in which flow from the turbine internal cavity is directed through slots (45) in the connecting flanges (52-53) of adjacent rotor rows to a cooling flow passage (43) of a heat shield (60) controlled by flow restrictors (82). A portion of such flow is directed to bucket grooves (34) beneath the blade attachments (25B), thereby cooling the disc rim (32), and controlled by flow restrictors (80). The remaining flow is exhausted through a heat shield rim gap (81) thereby cooling the front disc rim (32) and the blade shank cavity (25A).

Abstract: Main piston servo-actuation system, with hydromechanic self-contained failure detection device, working with hydraulic fluid supplied by a pump, including two servovalves (1 and 2) which are identical in design, controlling a piston (3) mechanically linked to a position transducer (4) according to the electrical demand (6, 7) supplied by the feedback position control loops (8 and 9) for the servovalves (1 and 2) to the torque motors (12 and 13) of the servovalves. These loops (8 and 9) receive the same piston position request, and they are given feedback at the same time with the same position signal fed by the position transducer (4). The system is furthermore compensated by two pressure selection valves (14 and 15) and by its own interconnection servo lines.