The three Visual Approach Slope Indicators (VASIs), VASIS, T-VASIS and PAPI, approved by the international Civil Aviation Organization (ICAO) for use by turbojet aeroplanes are compared. The discussion is based upon published performance data including approach path measurements and pilot opinion, ergonomics and the ability to fulfill operational requirements. It is concluded from flight trial data and operational experience that T-VASIS is a more precise and sensitive aid than Red-White VASIS which has several deficiencies. The current policy of not using Red-White VASIS for routine operations in Australia is supported by the conclusions. It is predicted that PAPI also will be less satisfactory than T-VASIS. This prediction is based mainly on ergonomic principles. Performance data about PAPI is limited and consists mainly of relatively uninformative pilot acceptance surveys. Because insufficient objective parameters describing trajectories of aircraft from the intended user-population have been published, most of the claims for PAPI superiority remain unsubstantiated. Accordingly, it is recommended that PAPI be evaluated using objective measures in a controlled experimental environment with transport aircraft.


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    Title :

    Analytical Comparison of Three Visual Approach Slope Indicators: VASIS, T-VASIS and PAPI


    Contributors:
    J. Millar (author)

    Publication date :

    1984


    Size :

    56 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English