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HAI_Fly_Higher_Chart_-_Various_Environments

Note: Stated HAI Recommended flyover height is at or above 1000’ for small helicopters to stay below 65 dB. They would need to be at about 2000’ to stay below 60 dB. (This has been confirmed by Dr. John Leverton, HAI Acoustics Chair).

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HAI_Fly_Higher_Chart_-_Various_Environments

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  1. Note: Stated HAI Recommended flyover height is at or above 1000’ for small helicopters to stay below 65 dB. They would need to be at about 2000’ to stay below 60 dB. (This has been confirmed by Dr. John Leverton, HAI Acoustics Chair)

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