Definitions for controlled airspace
Controlled airspace is airspace of defined dimensions within which ATC services are provided. The level of control varies with different classes of airspace. Controlled airspace usually imposes higher weather minimums than are applicable in uncontrolled airspace. It is the opposite of uncontrolled airspace. Controlled airspace is established mainly for three different reasons: ⁕high-volume air traffic areas, e.g. near airports ⁕IFR traffic under ATC guidance ⁕security, e.g. ADIZ Controlled airspace usually exists in the immediate vicinity of busier airports, where aircraft used in commercial air transport flights are climbing out from or making an approach to the airport, or at higher levels where air transport flights would tend to cruise. Some countries also provide controlled airspace almost generally, however in most countries it is common to provide uncontrolled airspace in areas where significant air transport or military activity is not expected. ICAO classifies airspace in seven classes from classes A to G. Controlled airspace is classes A to E, in order of decreasing ATC regulation of flights. Flight under instrument flight rules is allowed in all controlled airspace; flight under visual flight rules is permitted in all airspace except class A.
Dictionary of Military and Associated Terms
An airspace of defined dimensions within which civilian air traffic control services are provided to control flights.
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