Helicopter Association International
 BK117 and BO105

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General
Maximum distance and altitude separation from noise-sensitive areas are the most effective means of noise abatement.

Control movement should be gradual and smooth.

Noise exposure is:

  • lower on the left side than on the right side of the helicopter
  • lower to the sides of the flight path than directly underneath
  • lower upwind than downwind of the helicopter 

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