Noise in helicopters and its effect on auditory damage in pilots

The effects of noise on hearing impairment was examined in 46 flyers in cabins of three types of helicopters. In spite of high values of the total noise level and its harmful effects in all the examined types of helicopters the statistically significant increase in hearing impairment was not found. Considering that flyers wear the helmet headphones for communication which in the same time protect them from harmful effects of environmental noise, hearing impairment was of a milder degree and of a smaller percentage.