instrument flight rule

Japanese: instrument flight rule(英語表記)instrumentflightrule
instrument flight rule

…When pilots operate aircraft in conditions where there is insufficient visibility for them to rely on their own eyesight, they must fly using on-board instruments while constantly receiving instructions from air traffic control regarding the aircraft's flight route, altitude, and flight method. This method of flight is called instrument flight rules, or IFR for short. Currently, scheduled airlines usually operate under IFR even when visibility is good, in order to prepare for weather changes en route and to prevent collisions and close encounters with other aircraft. …

From [Aviation Weather]

... Aviation weather observations are conducted precisely because each airport has minimum weather conditions for safe takeoff and landing, and flight procedures are restricted by weather conditions even when the weather is better than the minimum conditions.
[Flight method]
There are two flight rules: visual flight rules (VFR) and instrument flight rules (IFR). If the ground visibility at an airport is 5km or more and the cloud height is 300m or more (450m at some airports), the weather conditions are called visual meteorological conditions (VFR meteorological conditions (VMC)), and aircraft can fly according to VFR.

*Some of the terminology that refers to "instrument flight rule" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…航空機の運航に当たり,パイロットの目視に頼って飛行できる十分な視界が確保されていない場合は,航空機の飛行経路,飛行高度,飛行方法などについて,つねに航空交通管制の指示を受けながら,機上の計器指示に頼って飛行しなければならない。この飛行方式を計器飛行方式instrument flight ruleといい,略してIFRとも呼ばれる。現在,定期航空では,途中の気象変化に備え,また他機との衝突や異常接近を防ぐため,視界のよいときでもIFRで運航しているのがふつうである。…

【航空気象】より

… 航空気象観測がきめ細かく行われるのは,航空機を安全に離着陸させるための最低気象条件が各飛行場で決められており,気象状態が最低気象条件より良い場合でも,飛行方式を気象状態によって制限するためである。
[飛行方式]
 飛行方式には有視界方式visual flight rule(VFR)と計器飛行方式instrument flight rule(IFR)がある。いま飛行場の地上視程が5km以上,雲高が300m(一部の飛行場は450m)以上あれば,その気象状態を有視界気象状態VFR meteorological condition(VMC)と呼び,航空機はVFRに従って飛行できる。…

※「instrument flight rule」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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