![]() ![]() Each dosimeter was calibrated with a calibration unit at 114 dB before every flight. Two noise dosimeters were used for data collection. ![]() This wind noise is an issue, but, once again, weight, cost, and construction techniques limit the insulation manufacturers can install. In addition, just as when driving a vehicle down a freeway, the sound made by the surrounding air moving around the cabin increases as the aircraft speed increases. Weight and cost restrictions do not allow for the average general aviation aircraft to obtain a sound level that is comparable to that of an automobile. Cars, however, are usually much quieter due to the exhaust equipment. Much as in a car, the aircraft engine produces sound as more power is demanded by the operator. Two of the biggest sources of noise are the sounds from the engine running while in flight and the sounds of the wind rushing around the aircraft as it moves through the air. ![]() The flight instructor may conduct up to five training flights in one day, whereas the average student or recreational aviator will utilize the aircraft at a much lower rate, usually about two to three times per week or less. The main difference between people who may use the aircraft for pleasure instead of business (such as a flight instructor) is the different duration of exposure to the ambient sounds. Many people across the country utilize these two types of aircraft on a daily basis both for pleasure and to earn a living. This study looked at two specific and common general aviation airplanes: the Cessna 172S model, which is a four-passenger, single-engine aircraft, and the Piper Seminole, which is a four-passenger, multi-engine aircraft with wing-mounted engines. OSHA requires that workers use some sort of personal protection equipment once sound levels exceed 85 decibels. ![]() General aviation aircraft are notoriously noisy inside the cabin, and many people are unaware of the potential threat of exposure to such high sound levels. A headset is adequate hearing protection for a projected eight-hour period, given the sound levels found in this study. Pilots are subjected to hazardous sound levels. Interior Sound Levels in General Aviation Aircraft ![]()
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