Abstract: The investigation of vestibular apparatus function has been carried out on105 aircrew, who had come under medical care because of serious illusion inflying in the period from 1973 to 1977. The data on the main parameters ofelectronystagmus duration, frequency, amplitude, speed of slow phase, C. P.and D. P. are presented.The change of parameters from normal in the caloric-induced electronys-tagmus was revealed in 80 of 105 aircrew with serious illusion in flying, thusconstituting 76.2%, C. P. and D. P. in the caloric-induced electronystagmuswas revealed in 49 of 105 cases, thus constituting 46.7%. It shows that thecaloric-induced electronystagmus provide a practical, objective and quantita-tive method for assessment of serious illussion in flying.

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