Abstract: A bladed rotor turning tool comprising a rotatable shaft (1), a finger (7) articulated on the end of the shaft about an axis substantially perpendicular to the shaft axis, the inclination of the finger relative to the shaft axis being controlled by cam means (10,11,12 and 14) so that the finger varies between being substantially perpendicular to the shaft axis and being substantially parallel to the shaft axis at diametrically opposed shaft positions. The cam means may comprise a cam surface (14) at the end of a sleeve (13) in which the shaft is positioned and means (10,11,12) for urging the finger into contact with the cam surface. Two such fingers may be provided to improve turning.

Abstract: A device for turning the rotor of a gas turbine engine for purposes of inspection has a tubular rod projecting through the casing of the engine into proximity with rotor blades of the engine. The rod has a nozzle directing a jet of air onto the blades to turn the rotor. The rod is movable axially so that when it is desired to stop the rotor the free end of the rotor engages an annular surface of the rotor to exert a braking force thereon. The rod moves under the action of a spring. Air to the nozzle is supplied through a hand-operated valve and the air supply is taken through a cylinder having a piston connected to the rod. The arrangement is such that when the valve is opened to feed the nozzle and turn the rotor, the air pressure moved the piston in the sense of retracting the rod from the braking position.