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Precision approach path indicator : ウィキペディア英語版 | Precision approach path indicator
A precision approach path indicator (PAPI) is a visual aid that provides guidance information to help a pilot acquire and maintain the correct approach (in the vertical plane) to an airport or an aerodrome. It is generally located beside the runway approximately 300 meters beyond the landing threshold of the runway. ==Development== The Precision Approach Path Indicator system was first devised in 1974 by Tony Smith and David Johnson at the Royal Aircraft Establishment in Bedford, England. It took them a further two years to fully develop the technology. Smith and Johnson's work was honoured by a commendation from the RAE, a Fellowship from the Aeronautical Society, an award from the American Flight Safety Foundation, and a Gold Medal from the British Guild of Air Pilots. Research Engineers (RE) were also heavily involved in the project, having produced and supplied PAPI units for the first trials that were conducted. The same design is still in use today, and in fact was used by NASA's Space Shuttle for its safe landing, for which Johnson was interviewed by UK local news media and TV. Short Form:PAPI 〔http://www.research-engineers.com/about_papi.html〕
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