Helicopter Association International
 Bell, 206A, 206B, 206B-3,206L, 206L-1, 206L-3, 206LT

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General
In general, left side (port) of helicopter is louder, except during an approach/descent, where the right side (starboard) is louder because of Blade-Vortex Interaction (BVI) noise.
 

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Helicopter Association International
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