Bell Helicopter, 204, 205, 212, UH-1. AH-1, Series Helicopters

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General

In general, you can eliminate the most offensive sounds of the 204, 205, 212/UH-1, AH-1 series helicopters and other medium helicopters by keeping them out of the slap region shown on reverse side. This is not always possible, of course, when the slap regions cannot be avoided; fly through them as quickly as possible. There are also other methods of reducing helicopter noise, and you should use them when you can, whether you are flying within the slap boundary or not.
 

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