decision height

Japanese: decision height(英語表記)decisionheight
decision height

…During a landing approach, a pilot must decide whether to land or return at a certain altitude. This altitude is called the decision height (DH). In Category I, visibility is at least 0.5 miles and DH is at least 200 feet. …

From [Aviation Weather]

…Here, minimum sector altitude is the minimum safe flight altitude in an emergency (when an aircraft is unable to confirm its own position) set by adding 1000 feet (300 m) to the height of all obstacles in the area contained within a radius of 25 nautical miles (46 km) from the airport. Decision HeightAirports have a decision height. This is the minimum altitude that an aircraft attempting to land can descend to using instrument flight. …

*Some of the terminology that mentions "decision height" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…着陸進入中,パイロットはある高度に達した時点で着陸をするか,復航をするか決めなければならない。この高度をデシジョンハイトdecision height(D.H.)という。カテゴリーIでは視程が0.5マイル以上で,D.H.は200フィート以上である。…

【航空気象】より

…ここで最低扇形別高度minimum sector altitudeとは,飛行場を中心に半径25カイリ(46km)以内に含まれる区域にあるすべての障害物の高さに1000フィート(300m)を加えて設定した緊急時(航空機が自己の位置を確認できなくなったとき)の安全飛行最低高度である。進入限界高度decision height飛行場には進入限界高度が決められている。これは着陸しようとする航空機が計器飛行で降下することができる最低の標高をいう。…

※「decision height」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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