propeller blades 28 and the surplus of oil is returned to the ejector pump inlet to act as the motive flow 61 to continuously draw oil from the sump 39 to minimize the clogging of the ejector pump 33 the components of the propeller actuation system 30 32 and the secondary circuit components resulting from contaminant residing in the sump oil it is recommended that a filter or strainer 60 be mounted in one of the line of the secondary circuit 31 preferably in line 35 and preferably upstream of the above components as indicated at 68 and 69 it is also contemplated to use the surplus oil flow from the ejector pump 33 and or the propeller pump 32 in excess to that required to satisfy the propeller control and actuation unit for any other suitable purpose such as to provide back up lubrication to critical propeller reduction gearbox gears and bearings or other components which are rotating during engine shutdown propeller windmilling mode or to provide a oil heating source during high altitude operation where outside air temperatures are very low this is particularly useful for propeller windmilling for extended periods that may be undertaken to maximize the range of aircraft with one or more engines inoperative the above described invention is advantageous in that it provides for a continued supply of pressurized oil which may.