Monitoring of an aircraft propulsion system

A method for monitoring a propulsion system of an aircraft, the propulsion system having a turboshaft engine and the aircraft having at least one counter for a damage to the turboshaft engine using at least one parameter of the turboshaft engine, the method comprising:

• receiving a target service life;
• calculating, for each counter, a maximum incrementation rate of the counter so that the counter remains below a predefined threshold throughout the target service life;
• calculating, for each counter and for each parameter of the counter, a threshold such that, so long as the parameter does not exceed the threshold, the incrementation rate of the counter remains lower than the maximum incrementation rate;
• calculating, on the basis of the threshold or thresholds, at least one limit of an operating variable of the turboshaft engine to not be exceeded so that the incrementation rate of the counter remains lower than the maximum incrementation rate;
• and
• transmitting to a display device on the aircraft a current value of the operating variable and the limit of the operating variable.