Visual landing aids for aircraft

Details Visual landing aids for aircraft Visual landing aids for aircraft

1981-03-10

1984-02-07

Walsh, Donald P.

Illumination

Light source and modifier

Adjustable or repositionable modifier

362240, 362231, 362293, 340954, 356 6, 356 18, 356391, G01B 908

Patent

active

044306954

ABSTRACT:
Apparatus for aligning an aircraft landing aid projector of the type which comprises a light source located at the focus of a parabolic reflector, a lens mounted coaxially with the parabolic reflector and a filter disposed intermediate the reflector and lens close to the focal point of the lens. The apparatus comprises a base having a surface portion for supporting a projector, a lens for focussing light from the projector onto an image receiving means and means allowing observation of the image receiving means. The filter of a projector is correctly positioned when it appears in focus on the image receiving means.

REFERENCES:
patent: 2549860 (1951-04-01), Swanson
patent: 3012224 (1961-12-01), Ferguson

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