[Circadian biorhythms and flight planning]

It has been shown that circadian rhythms of functional systems of the human body exert a noticeable effect on psychophysiology and reliability parameters of pilots and cadets which may be of special importance in flights on a shift basis. The dysbalance in work--rest cycles and circadian biorhythms decreases strongly qualitative and quantitative indices of pilot activities. In some cases this may cause erroneous actions, contingent situations and accidents.