Noise received at the ground, and particularly noise exposure patterns, may be modified by varying airplane operational procedures. A major improvement in aircraft flyover noise is achieved with the introduction of the wide-bodied transports powered by the new technology high bypass ratio turbofan engines in acoustically treated nacelles. Emphasis is placed on the study of takeoff and approach operational procedures for moderating community noise exposures. An analysis is performed regarding the effect of variations in operational procedures on noise under the flight path as well as regarding the shapes and areas inclosed by noise contour "footprints" in order to evaluate the use of these operational techniques for various noise situations. Of the three takeoff and three approach procedures reviewed, thrust outback on takeoff and two segment approach appear to be most suitable for noise abatement, with delayed transition from approach to landing configuration also indicating some benefit.

Media Info

  • Features: References;
  • Pagination: p. 139-145

Subject/Index Terms

Filing Info

  • Accession Number: 00155779
  • Record Type: Publication
  • Source Agency: International Aerospace Abstracts
  • Report/Paper Numbers: Proceeding
  • Files: TRIS
  • Created Date: Sep 28 1977 12:00AM