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Abstract:Eleven of the most popular twin-engine general-aviation light aircraft were tested for the noise intensity present during normal cruising operations at 2000, 6000, and 10000 feet MSL (mean sea level). Although generally quieter than single-engine planes, these aircraft, in comparison with currently accepted DRC (Damage-risk criterion) curves, have noise levels (even in the quietest plane tested) that could be damaging. However, a well fitted pair of earplugs should protect against the physiologically damaging noise intensities encountered in the study.
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