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Definition of Control zone

Control zone Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
(*) A controlled airspace extending upwards from the surface of the Earth to a specified upper limit. See also control area; controlled airspace; terminal control area.
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )
Control zone Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
A control zone (CTR or controlled traffic region) in aviation is a volume of controlled airspace, normally around an airport, which extends from the surface to a specified upper limit, established to protect air traffic operating to and from that airport. Because CTRs are, by definition, controlled airspace, aircraft can only fly in it after receiving a specific clearance from air traffic control. This means that 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 passing traffic information.

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