positive control area


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positive control area (PCA)

Airspace within which there is positive control of aircraft. Flight in a PCA normally is conducted under IFR (instrument flight rules). A PCA is designated throughout most of the continental United States, and its vertical extent is from 18,000 feet up to and including flight level 600. The term has been superceded by airspace Class Alpha (Class A). See airspace Class A.
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