Method of determining whether to replace a high pressure pump in a hydraulic regulation system of a turbomachine

A method of determing when to replace a high pressure pump in a hydraulic regulator system of a turbomachine including a high pressure positive displacement pump delivering a flow rate that is a function of an engine speed of the turbomachine as defined by a control computer, the flow rate being delivered to an actuator for actuating variable geometry vanes of the turbomachine and to a bypass valve arranged in a feed pipe for feeding fuel to engines of the turbomachine, the method comprising:

• starting the engines of the turbomachine at a low engine speed, the valve being closed;
• using the control computer to order a movement of the actuator;
• progressively increasing the engine speed until the flow rate reaches a predetermined value that is sufficient for opening the valve;
• storing in the control computer a position of the actuator and the engine speed corresponding to the opening of the valve;
• repeating the preceding operations at successive instants during a lifetime of the engines of the turbomachine;
• and
• replacing the high pressure positive displacement pump when the engine speed exceeds a predetermined value.