Fly Neighborly Guide - Helicopter Association International

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Fly Neighborly Guide4 How to Operate Helicopters QuietlyFigure 5Noise AbatementApproach Techniquesfor Small/LightHelicoptersR/C500Speed20 40 60 80 100 120 140 (knots)● ● ● ● ● ● ●FPM020 40 60 80 100 120 140 (mph)● ● ● ● ● ● ●flare and landingR/D-500optional conversions toapproach glidescope-1,000approachmain rotor impulsivenoise boundary4.7.2 Medium and heavy helicopters.Follow the noise abatement flight technique given below and illustrated in Figure 6.n When commencing approach, begin descent at a rate of at least 200 fpm beforereducing airspeed, then reduce airspeed while increasing the rate of descent to800-1000 fpm.n At a convenient airspeed between 50 and 80 knots, set up an approach glideslopewhile maintaining the 800-1000 fpm rate of descent.n Increase the rate-of-descent if main rotor BVI noise is heard, or a steeperglideslope is required.n Just prior to the approach to the ‘flare,’ reduce the airspeed to below 50 knotsbefore decreasing the rate-of-descent.n Execute a normal flare and landing, decreasing the rate of descent and airspeedappropriately.12produced by the Helicopter Association International n Fly Neighborly Committee
Fly Neighborly Guide4 How to Operate Helicopters QuietlyFigure 6Noise AbatementApproach Techniquefor Medium andHeavy HelicoptersR/C500airspeed in knotscruiseFPM020 40 60 80 100 120R/D-500flare andlandingnormal approachnoise abatementapproachmain rotor impulsivenoise boundaryconversions to approachglidescope-1,000approachThe noise abatement flight techniques discussed above for small/light and medium helicoptersreduce the ground area exposed to a given noise level by as much as 80 percent.Figure 7 illustrates the potential noise benefits when compared to a normal approach.Figure 7Ground NoiseExposure Footprintcontour of equal noise levelnormal approachnoise abatement approach13produced by the Helicopter Association International n Fly Neighborly Committee
Page 6 and 7: Fly Neighborly GuideForewordIn the
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Page 16 and 17: Fly Neighborly Guide4 How to Operat
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Page 26 and 27: Fly Neighborly Guide7 Managing Publ
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Page 30 and 31: Fly Neighborly Guide Appendix 1What
Page 32 and 33: Fly Neighborly Guide Appendix 2FAA
Page 34: Fly Neighborly GuideGlossaryThe acr

Fly Neighborly Guide - Helicopter Association International

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