Approach slope indicators

Details Approach slope indicators Approach slope indicators

1977-09-22

1980-01-08

Sebastian, Leland A.

Illumination

Plural light sources

Particular wavelength

340 26, B64F 120, G08G 500

Patent

active

041830784

ABSTRACT:
An indicator unit for use at the edge of airfield runways which produces a split beam of light, the interface of which may be adjusted to the required angle of flight path to guide incoming aircraft, the indicator unit comprising a support assembly having mounted therein at least two projection tubes, each projection tube housing a removable pre-aligned projector having a light source, a red-passing filter and a divergent lens disposed to produce the split beam of light.

REFERENCES:
patent: 2567046 (1951-09-01), Anderson
patent: 2968023 (1961-01-01), Ferguson et al.
patent: 2975400 (1961-03-01), Ferguson et al.
patent: 4064424 (1977-12-01), Hergenrother

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