Method and system for monitoring the performance of a pair of hydraulic accumulators on an aircraft

A method for monitoring a performance of a pair of hydraulic accumulators in a hydraulic system of an aircraft, the pair of hydraulic accumulators comprising a first hydraulic accumulator and a second hydraulic accumulator configured to temporarily deliver hydraulic power in an emergency situation, the method being implemented by a monitoring system comprising electronic circuitry, the method comprising:

• collecting pressure values from the first hydraulic accumulator and the second hydraulic accumulator during each of N flights of the aircraft, where N≥2, the pressure values being provided by pressure sensors fitted to the aircraft;
• for each of the N flights, calculating a mean pressure value (accum_mean_j) for each of the first hydraulic accumulator and the second hydraulic accumulator, as a function of pressure values contained in a determined time interval of a flight;
• each of the first hydraulic accumulator and the second hydraulic accumulator, calculating a mean, denoted M1 (accum_roll_1) for the first hydraulic accumulator and M2 (accum_roll_2) for the second hydraulic accumulator, of the N mean pressure values calculated for the N flights;
• calculating a parameter P (rolling_difference), which is an absolute value of a difference between the means M1 and M2 calculated for the first hydraulic accumulator and the second hydraulic accumulator;
• calculating a leak indicator (final_difference) which is a function of a difference between the parameter P (rolling_difference) and a determined reference value (reference_difference);
• and
• triggering an alert when the leak indicator is greater than a first predetermined threshold, and not triggering an alert when the leak indicator is less than or equal to the first predetermined threshold.