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Definition of Approach control

Approach control Definition from Government Dictionaries & Glossaries
DOD Dictionary of Military Terms
A control station in an air operations control center, helicopter direction center, or carrier air traffic control center, that is responsible for controlling air traffic from marshal until hand-off to final control. See also helicopter direction center; marshal. (JP 3-04.1)
  
Source: U.S. Department of Defense, Joint Doctrine Division. ( About )