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Runway end identifier lights (REIL) are installed at many airports to provide rapid and positive identification of the approach end of a particular runway. The system consists of a pair of synchronized flashing lights located laterally on each side of the runway threshold. REILs may be either omnidirectional or unidirectional facing the approach area.〔(FAA Aeronautical Information Manual, Chapter 2 (Aeronautical Lighting and Other Airport Visual Aids), Section 1 (Airport Lighting Aids) )〕 They are effective for:〔 * Identification of a runway surrounded by a preponderance of other lighting * Identification of a runway which lacks contrast with surrounding terrain * Identification of a runway during reduced visibility The International Civil Aviation Organization (ICAO) recommends that:〔(【引用サイトリンク】 Aerodrome Design and Operations ) §5.3.8, "Runway threshold identification lights"〕 * Runway threshold identification lights should be installed: * * at the threshold of a non-precision approach runway when additional threshold conspicuity is necessary or where it is not practicable to provide other approach lighting aids; and * * where a runway threshold is permanently displaced from the runway extremity or temporarily displaced from the normal position and additional threshold conspicuity is necessary. * Runway threshold identification lights shall be located symmetrically about the runway centre line, in line with the threshold and approximately 10 meters outside each line of runway edge lights. * Runway threshold identification lights should be flashing white lights with a flash frequency between 60 and 120 per minute. * The lights shall be visible only in the direction of approach to the runway. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Runway end identifier lights」の詳細全文を読む スポンサード リンク
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