What is the critical part of an airport?

In aviation, a critical area refers to a designated area of an airport that all aircraft, vehicles, persons or physical obstructions must remain clear of when one or more Instrument Landing Systems (ILS) are in use, to protect against signal interference or attenuation that may lead to navigation errors, or accident.



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ILS Categories ILS's aren't available at all airports and some airports have other navigation aids available to help guide the aircraft.

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Mexico City, Mexico (MEX) This also includes the 17,800-foot active volcano, Popocatépetl. This means that the area in which aircraft can be directed in to land is extremely tight. Whereas most airports will have aircraft lined up with the runway around 12 miles out, at Mexico City, this only happens at five miles.

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