A method of determining a sound nuisance level outside an aircraft, wherein an aircraft is fitted with a plurality of external microphones, then during a flight of the aircraft, sound levels are measured using on-board microphones and at least two components are measured of the speed of the aircraft relative to air, and thereafter the kurtosis of samples of the sound level measurements is calculated and a model is determined of variations in a sound nuisance level as function of the air speed components, with the sound nuisance level being determined as a function of the kurtosis.
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