This article deals with issues related to assessing the impact of the pilot's psychophysiological pressure on the quality of the flight piloting technique. The quality of the aircraft control technique was evaluated by changing one of the flight parameters, namely the pitch angle during the landing approach. The analysis of the autocorrelation functions of the controlled parameter and their spectra were used to conduct the research. The proposed mathematical apparatus makes it possible to track the moment the pilot's psychophysiological pressure increases to a state of emotional instability, build a function of its influence on the quality of the flight piloting technique, and develop an effective method of anti-stress training for crews.