Helicopter Association International
 Bell Helicopter 427, 429

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  • Increasing the altitude above and/or the distance from noise sensitive areas is the most effective noise abatement strategy.
  • Control inputs should be applied in a smooth and gradual manner.
  • The noise abatement flight techniques described below are advisory guidelines only. If flying according to these procedures conflicts with operating the aircraft in a safe manner, then all safety-related procedures take precedence.

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Helicopter Association International
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