Abstract: A method for estimating the maximum instantaneous distortion with a fewmeasured RMS values of the fluctuation pressures is presented based on reference[1]. This method enables to estimate the maximum instantaneous distortion value by assuming that the turbulence distribu tion is uniform and equal to the average value of s few measured RMS values. A comparison between the maximum instantaneous distortion values measured experimentally and estimated by this method shows that the maximum instantaneous distortion can be estimated by the average value of a few men sured RMS values of the fluctuation pressune with the same accuracy as that obtained by the method reference [1].