When I agreed to give this paper I did not appreciate the problems I would have in trying to quantify what I had as a pilot been putting into practice for some years, I have always been conscious of helicopter noise when operating into heliports or landing areas within a community and tried, by practical means, to reduce the amount of noise annoyance.

Subject to the economics being satisfactory, the more widespread use of helicopters in passenger transport might easily be seriously inhibited by restrictive noise limitations. Pilots can help to avoid this if they operate the present generation of noisy helicopters with due regard to this problem.