Category (ILS) - Category

Japanese: カテゴリー(ILS) - かてごりー
Category (ILS) - Category

…The glide path is modulated at 90Hz above and 150Hz below, and the displacement indication to the on-board instruments is the same as that of the localizer. The height of the glide path at the end of the runway is at least 50 feet (1 foot is about 0.3 m), and the allowable error is usually ±10 feet, but in the case of Category II where the landing decision height (final decision altitude, see below) is less than 200 feet, and Category III where it is less than 100 feet, the allowable error is +10 feet and -0 feet, respectively, to ensure a clearance between the wheels of the airplane at the end of the runway. (3)Marker beacons (also simply called markers) are installed at a designated position directly below the approach course, and emit a unique directional modulated radio wave (75MHz) upward, and when passing over the ground, the pilot is notified of the passing position by lighting up the lights on the instrument panel in the cockpit and by a modulated sound. …

*Some of the terminology used in reference to "Category (ILS)" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…グライドパスに対し上方が90Hz,下方が150Hzで変調されており,機上計器への変位指示はローカライザーと同様である。滑走路端におけるグライドパスの高さは最低50フィート(1フィートは約0.3m)を基準とし,その許容誤差は通常±10フィートだが,着陸のデシジョンハイト(最終決定高度,後出)が,200フィート未満のカテゴリーII,同じく100フィート未満のカテゴリーIIIの場合は許容誤差がそれぞれ+10フィート,-0フィートとなり,滑走路端において飛行機の車輪との間隙(かんげき)が確保されるようになっている。(3)マーカービーコンmarker beacon(単にマーカーともいう)は進入コース直下の定められた位置に設けられ,上方に向け特有の指向性変調電波(75MHz)を発射し,上空通過時に操縦室内の計器板上のライトの点灯および変調音で,パイロットに通過位置を知らせる。…

※「カテゴリー(ILS)」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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