FIELD: transport.
SUBSTANCE: invention relates to aircraft (AC) landing systems, in particular to light signalling systems. System of aircraft (AC) altitude above take-off runway (TRW) threshold indication includes two installed on axis at the end of TRW laser emitters of visible light range with collimated beams directed towards moving object at an angle to TRW plane that is less than angle of AC descending trajectory during landing, herewith, the beams are set at small (up to 5°) equal angles symmetrically relative to vertical plane going through TRW axis.
EFFECT: higher accuracy of landing and extension of TRW threshold intersection altitude indication range.
9 cl, 3 dwg
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