In aviation, the instrument landing system (ILS) is a precision radio navigation system that provides short-range guidance to aircraft to allow them to approach a runway at night or in bad weather. In its original form, it allows an aircraft to approach until it is 200 feet (61 m) over the ground, within a mile (800 m) of the runway.

首先，CAT I,CATII,CATIII，是通指盲降种类I,II,III，而不是猫I，猫II，猫III。 CAT是英文单词category（种类）的缩写。 盲降,又称仪表着陆系统，航空字典上的标准写法是：ILS Instrument Land System. 盲降是仪表着陆系统的俗称。 因为仪表着陆系统能在低天气标准或飞行员看不到任何目视参考的天气下，引导飞机进近着陆，所以人们就把仪表着陆系统称为盲降。 仪表着陆系统的大致运行过程如下： ILS进场首先是下滑到大约3000英尺，斜向接近机场。 在输入指定跑 …

2024年12月18日 · These status lists are available for aviation users in order to denote qualified U.S. airports and runways for Category I (CAT I), Category II (CAT II) and Category III (CAT III) Instrument Landing System (ILS) operations. The lists also contain information for foreign CAT II and CAT III airports and runways approved for U.S. air carriers.

2019年6月12日 · A CAT I approach is your basic, run of the mill, "two hundred and a half" ILS approach. Minimums can be higher for this approach, but not lower. It can be hand flown, meaning no autopilot is required and it can be done with the onboard equipment found on most General Aviation instrument qualified aircraft.

This notice provides guidance for all principal inspectors (PI) and other assigned aviation safety inspectors (ASI) who oversee and authorize operators to conduct reduced visibility flight operations, including instrument landing system (ILS) Category II/III (CAT II/III) operations, under Title 14 of the Code of Federal Regulations (14 CFR) part...

2020年2月16日 · 一套ILS系统主要由两个子系统，一个提供水平引导（航向台Localizer），另一个提供垂直引导（下滑台，Glide Slope或Glide Path）。 通过两个子系统的配合使得飞机准确降落在跑道上。而这个引导是由飞机上的ILS接收机对接收到的无线电信号的调制深度进行比较得到的。

cat iii分为cat iiia、cat iiib、cat iiic。 符合CAT IIIa时，降落要求RVR（跑道视距）不低于700英尺。 符合CAT IIIb时，降落要求RVR不低于150英尺。

I understand that Cat I, II, and III ILS approaches have progressively smaller weather minimums. However, I am asking about the aircraft themselves. What are the differences between Cat levels as concerns aircraft equipment requirements and approvals?

2024年9月24日 · Learn everything about Instrument Landing Systems (ILS) and how they help aircraft land safely in low visibility. Discover how ILS works, its key components, categories, and how pilots use it to land in difficult conditions.

The instrument landing system (ILS) is the ICAO standard, non-visual aid to final approach and landing. The ILS is defined as a precision runway approach aid which provides pilots with both vertical and horizontal guidance during an approach to land.