Controlled propeller pitch lock actuation system

摘要

A variable pitch propulsor system (20) with a propeller pitchlock system (46) having a pitchlock solenoid valve (43) located in communication with a pitchlock pressure circuit (PPLc) to selectively actuate pitchlocking in response to a controller (C). The pitchlock solenoid valve includes an electro-mechanical device which is normally closed but may be commanded to electrically open and dump the pitchlock pressure which causes actuation of the pitchlock system. The pitchlock solenoid provides a mechanism which will selectively pitchlock the propulsor system; permits a built in test routine to determine the condition of the pitchlock system through a commanded propeller pitchlock sequence; requires no mechanical link between the rotating and non-rotating propeller components to initiate pitchlock; is independent of engine and gearbox configurations; and can initiate pitchlock remotely with a signal from a remote location.