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optical landing system
An optical landing system (OLS) (nicknamed "meatball" or simply, "Ball") is used to give glidepath information to pilots in the terminal phase of landing on an aircraft carrier.〔(Aircraft Launch and Recovery Operations Manual )〕 From the beginning of aircraft landing on ships in the 1920s to the introduction of OLSs, pilots relied solely on their visual perception of the landing area and the aid of the Landing Signal Officer (LSO in the U.S. Navy, or "batsman" in the Commonwealth navies). LSOs used colored flags, cloth paddles and lighted wands. The OLS was developed after World War II and was deployed on U.S. Navy carriers from 1955. In its developed form, the OLS consists of a horizontal row of green lights, used as a reference, and a column of vertical lights. The vertical lights signal whether the aircraft is too high, too low, or at the correct altitude as the pilot descends the glide slope towards the carrier's deck. Other lights give various commands and can be used to require the pilot to abort the landing and "go around." The OLS remains under control of the LSO, who can also communicate with the pilot via radio.
==Components==
An optical landing system has several related components: the lights used to give visual cues to approaching aircraft, the light control system, and the mounting system.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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