The Vortex Advisory System (VAS) is based on wind criterion--when the wind near the runway end is outside of the criterion, all interarrival Instrument Flight Rules (IFR) aircraft separations can be set at 3 nautical miles. Five years of wind data have been obtained for 20 airports. By comparing the VAS wind criterion to the 5 years of wind data, the percentages of time that interarrival separations can be reduced at the 20 airports have been found. The percentages are given on an hourly and a monthly basis. Volume II (to be published at a later date) will examine the VAS effectiveness at Chicago O'Hare (ORD) with respect to the length of the intervals during which reduced separations might have been used. (Author)

  • Corporate Authors:

    Transportation Systems Center

    55 Broadway, Kendall Square
    Cambridge, MA  United States  02142

    Federal Aviation Administration

    800 Independence Avenue, SW
    Washington, DC  United States  20591
  • Authors:
    • Hallock, J N
  • Publication Date: 1980-5

Media Info

  • Pagination: 122 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00318884
  • Record Type: Publication
  • Source Agency: National Technical Information Service
  • Report/Paper Numbers: TSC-FAA-80-11-1, FAA-RD-80-62-1
  • Files: NTIS, USDOT
  • Created Date: Oct 27 2002 12:00AM