Device and method for monitoring the lifetime of a hydraulic apparatus of an aircraft

A method for monitoring the lifetime of at least one hydraulic apparatus of an aircraft subjected to variations of hydraulic pressure in flight, the method comprising

• receiving, on a reception interface during a reception step, measurement data representative of the hydraulic pressure of the at least one hydraulic apparatus as a function of flight time, characterized in that
• detecting, during a detection step, a pressure load of a damaging nature, defined by the fact that the pressure comprises a pressure increase, greater than a predetermined damage threshold greater than zero, followed by a pressure reduction greater than the predetermined damage threshold, is detected by a processing device, based on the measurement data,
• calculating, during a calculation step a pressure variation amplitude, equal to the maximum of the absolute value of the pressure increase of the pressure load of a damaging nature and of the absolute value of the pressure reduction of the pressure load of a damaging nature, by the processing device,
• projecting, during a projection step, by the processing device the pressure variation amplitude onto a prescribed decreasing curve of damage model or prescribed decreasing straight line of damage model, giving a permissible number of pressure loads of a damaging nature as a function of the pressure variation amplitude, for determining the permissible number of pressure loads of a damaging nature corresponding to the pressure variation amplitude which has been calculated,
• calculating, during another calculation step, by the processing device a potential damage ratio equal to a determined number of reference loads, divided by the permissible number of pressure loads of a damaging nature which has been calculated, and
• incrementing, during a counting step a cumulative counter of potential damage ratio by the potential damage ratio which has been calculated.