OIL DISTRIBUTION SYSTEM FOR AIRCRAFT ENGINE WITH MAKE-UP FLOW

An oil supply system (130) for an aircraft engine (10) includes: an oil tank (32); a closed-loop oil circuit (52) including a component (22, 36), a pump (48) having a pump inlet (48A) and outlet (48B), and a de-aerator (54); a make-up flow conduit (60, 60', 60") connecting the oil tank (32) to the closed-loop oil circuit (52); a make-up pump (62, 62', 62") connected to the closed-loop oil circuit (52); a recirculation conduit (63) in parallel to the make-up pump (62, 62', 62") and bypassing the make-up pump (62, 62', 62"); a fixed orifice (65) fluidly connected to the make-up flow conduit (60, 60', 60") upstream of the closed-loop oil circuit (52) and downstream of the recirculation conduit (63), the fixed orifice (65) having an area selected to increase a pressure at an outlet (62B) of the make-up pump (62, 62', 62") above a pressure at the de-aerator inlet (54A); and a metering orifice (64) connected on the recirculation conduit (63) and having a flow circulating area selected to reduce a flow rate inputted into the closed-loop oil circuit (52) below a flow rate generated by the make-up pump (62, 62', 62").