The precision approach path indicator (PAPI) is described and helicopter lighting aids are discussed. The PAPI system indicates correct glide slope at ranges 10 km under good visibility conditions and provides information up to 300 m from touchdown. Two color light projector units, consisting of three simple optical projectors side by side in a box, tell the pilot if he is too high, too low, or on slope by the combination of red and white lights. Trials show that it can be used by a wide range of civil and military aircraft, e.g., the VC-10, small private airplanes, or helicopters. A mathematical model which predicts what pilots can see when landing in fog was used in order to optimize proposed approach lighting patterns for helicopters. If the lighting pattern is 730 m long, initial contact is possible at altitudes 100 m. Lighting trials show that red stop bar lighting and green taxiway centerline need further improvement.


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    Title :

    Airfield Visual Aids Research at the Royal Aircraft Establishment


    Contributors:
    A. J. Smith (author)

    Publication date :

    1981


    Size :

    29 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English