Categorizing a sound as noise can be very subjective. Sources of Noise in Aviation. The aviation environment is characterized by multiple sources of noise, both on the ground and in the air. Exposure of pilots to noise became an issue following the introduction of the first powered aircraft by the Wright Brothers, and has been a prevalent problem ever since. These auditory inputs allow pilots to assess and monitor the operational status of their aircraft.
All pilots know the sounds of a normal- functioning aircraft.
On the other hand, unexpected sounds or the lack of them, may alert pilots to possible malfunctions, failures, or hazards. Every pilot has experienced a cockpit or cabin environment that was so loud that it was necessary to shout to be heard. These sounds not only make the work environment more stressful but can, over time, cause permanent hearing impairment. Effects of Noise Exposure Physiologic Ear Discomfort. May occur during exposure to a 120 dB noise.