What does CTR mean in Transportation?

This page is about the meanings of the acronym/abbreviation/shorthand CTR in the Governmental field in general and in the Transportation terminology in particular.

Control Zone

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What does CTR mean?

Control zone
A control zone 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 ATC 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. In the USA the term control zone is no longer used and has been replaced by airspace class D. Typically it extends 5 miles in diameter with a height of 2500 ft AGL around small commercial airports. Aircraft are required to establish radio contact with the control tower before entering and to maintain in contact while in class D airspace. This implies that an aircraft must be equipped with at least a portable radio to fly in Class D airspace. In the UK, control zones are normally class D airspace and usually extend from the surface to 2000 ft AGL. They can be observed to be usually rectangular, extending along the axis of the main runway, although irregular shapes may be used where more complex airspace dictates this. A control area is often placed between a CTR and nearby airways to give uninterrupted controlled airspace to airways arrivals and departures.

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"CTR." Abbreviations.com. STANDS4 LLC, 2014. Web. 18 Dec. 2014. <http://www.abbreviations.com/term/514608>.

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