Propeller blade pitch actuation system

A powerplant lubrication and blade pitch actuation system comprising:

• a propeller blade pitch actuation system comprising:
• a propeller control module (PCM) for adjusting blade pitch on at least one propeller blade;
• a PCM drain line connected to the PCM to drain hydraulic fluid employed in adjusting the propeller blade pitch;
• a first drain line downstream of the PCM drain line;
• a second drain line downstream of the PCM drain line;
• and
• a valve comprising a first valve position and a second valve position, the first valve position connecting the PCM drain line to the first drain line, and the second valve position connecting the PCM drain line to the second drain line;
• and
• a drain line restriction connected to the first drain line;
• wherein a hydraulic pressure of the first drain line between the valve and the drain line restriction is greater than a hydraulic pressure of the second drain line.

A method for selectively increasing a hydraulic pressure force available to a propeller control module (PCM) of a propeller blade pitch actuation system for an aircraft, the method comprising:

• detecting a condition requiring increased hydraulic pressure force;
• signaling a valve to change position in response to the detected condition;
• and
• changing the valve position to decrease hydraulic pressure at a drain line for the PCM, changing the valve position comprising:
• disconnecting the drain line for the PCM from a drain line including a flow restriction;
• and
• connecting the drain line for the PCM to a drain line at a lower hydraulic pressure than the drain line including the flow restriction.