[Effect of vibration and noise on the work capacity indices of the crews of the MI-4 helicopters].

The study of certain parameters of performance of crewmembers of MI-4 helicopters revealed their significant changes after a working day. The percentage of errors in the reproduction of a preassigned muscular tension increased, the percentage of precise reactions to the moving object decreased, the critical frequency of light flickering decreased, the number of contacts during static tremometry increased. In the control group consisting of crewmembers of the aircraft Yak-40 these parameters varied insignificantly. This allowed the conclusion that the changes in the performance of MI-4 crewmembers were induced by vibration and noise. The intragroup analysis demonstrated more pronounced changes in the functions of commanders and flight engineers of MI-4 helicopters. This may be associated with a greater level of work and responsibility of these crewmembers.