Abstract: An anti-deployment device and method for preventing inadvertent deployment of a ram air turbine of an aircraft during servicing or repair of turbine employ an anti-deployment pin which can be manually inserted in a support arrangement for the pin on the aircraft when the ram air turbine is in the stowed position for preventing deployment of the turbine upon release of a lock mechanism which locks the turbine in the stowed position. The pin has an elongated body with an outer, flat contact surface portion which extends in a plane that is inclined with respect to a longitudinal center axis of the pin.

Abstract: Overspeed conditions in a ram air turbine are eliminated through a novel blade pitching mechanism. The mechanism includes a rotatable shaft with a hub mounted thereon for rotation therewith. The hub rotatably mounts at least one blade and a hollow blade pitch control shaft extends generally concentrically about the rotatable shaft and is mounted for reciprocating movement in a path toward and away from the hub. A reciprocating to rotary motion converting mechanism interconnects the control shaft and the blade so that the pitch of the blade can be controlled by controlling the position of the control shaft in the path. A first motor is provided for incrementally moving the control shaft within the path and a second motor is provided for rapidly moving the control shaft within the path to a position therein corresponding to a feathered position of the blades.