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 (IFR) is allowed in all controlled airspace (some countries also permit IFR in uncontrolled airspace); flight under visual flight rules (VFR) is permitted in all airspace except class A.

Other articles related to "controlled airspace, airspace, controlled":

Non-towered Airport - Procedures
... Non-towered airports may lie inside or underneath controlled airspace ... (IFR or VFR) take off and level out below the floor of controlled airspace, then radio for a clearance before climbing further ... in large urban areas so that VFR arrivals and departures can avoid controlled airspace altogether ...
Control Zone
... A control zone (CTR) in aviation is a volume of controlled airspace, normally around an airport, which extends from the surface to a specified upper limit, established to ... Because CTRs are, by definition, controlled airspace, aircraft can only fly in it after receiving a specific clearance from air traffic control ... at the airport know exactly which aircraft are in that airspace, and can take steps to ensure aircraft are aware of each other, either using separation or by ...
1956 Grand Canyon Mid-air Collision - Flight History
... authorized altitude of 21,000 feet, Captain Shirley flew under instrument flight rules (IFR) in controlled airspace to a point northeast of Palm Springs ... under IFR, was now "off airways"—that is, flying in uncontrolled airspace ... altitude of 19,000 feet and stayed in controlled airspace as far as Daggett, California ...
National Airspace System - Airspace Classification
... In the United States, airspace consists of classes A, B, C, D, E, and G ... The NAS includes both controlled and uncontrolled airspace ... It is the most controlled airspace and requires a pilot to carry an Instrument Flight Rating and proper clearance no matter what type of aircraft is being flown ...

Famous quotes containing the word controlled:

    To do the same thing over and over again is not only boredom: it is to be controlled by rather than to control what you do.
    Heraclitus (c. 535 B.C.–c. 475 B.C.)