Everything about Controlled Airspace totally explained
Controlled airspace is an aviation term used to describe
airspace in which traffic levels are such that it has been determined that
air traffic control (ATC) must provide some form of separation between aircraft. It is the opposite of
uncontrolled airspace.
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 (significantly the U. S.) also provide controlled airspace almost generally, however in most countries it's common to provide uncontrolled airspace in areas where significant air transport or military activity isn't 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 (IFR) is allowed in all airspace, controlled or uncontrolled; flight under
visual flight rules (VFR) is permitted in all airspace except A. Pilots of aircraft need to obtain an air traffic control clearance before they enter airspace of classes A or B, while entering classes C or D only requires being in communication with ATC. If flying under IFR they need to obtain a clearance to fly in any class of controlled airspace.
See also
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