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)


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    Title :

    Vortex Advisory System. Volume I. Effectiveness for Selected Airports


    Contributors:

    Publication date :

    1980


    Size :

    122 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Vortex Advisory System

    J. N. Hallock / E. A. Spitzer / W. D. Wood | NTIS | 1977


    Vortex Advisory System

    J. N. Hallock / E. A. Spitzer / W. D. Wood | NTIS | 1977