Patent ID: 8825228

Claim:
A method of assisting the piloting of an aircraft comprising a first rotor having a plurality of first blades with a first variable collective pitch, and a second rotor having a plurality of second blades with a second variable collective pitch, said aircraft having a power plant provided with at least one engine operating in a plurality of ratings, said power plant being monitored by a computer via a plurality of predetermined monitoring parameters, wherein said computer: determines the current first and second collective pitches at each instant, and causes an index to be displayed, said index pointing to said first collective pitch and to said second collective pitch in a diagram, said diagram having a first axis and a second axis that are graduated in collective pitch units relating respectively to the first collective pitch and to the second collective pitch; determines a limiting parameter corresponding to that one of the monitoring parameters that is the closest to its limit in the current operating rating of said engine; determines at least one available power margin for said engine, each power margin corresponding to the power to be delivered in order to cause the limiting parameter to reach a limit associated with one of said ratings; and determines one power limit curve per power margin and displays said limit curve in said diagram to inform the pilot about the first and second collective pitch margins that are available before reaching the limit for each rating.