"System And Method For Controlling Propeller Pitch"

Abstract: Systems and methods are disclosed for controlling the pitch angle (I) of a propeller and rotor assembly (14, 16) that selectively limit the pitch angle (I) according to a selected mode of operation. The system comprises an actuator (45) having forward and aft chambers (56, 58), an oil transfer bearing (OTB) (70), and a fine stop collar (86). The fine stop collar (86) includes a first passage (88) in fluid communication with the OTB (70) and forward chamber (56) during a ground-based mode of operation, and a second fluid passage (90) being in fluid communication with the OTB (70) and forward chamber during a flight-based mode of operation. FIG.1

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