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ground-controlled approach

American  
[ground-kuhn-trohld] / ˈgraʊnd kənˌtroʊld /
Or ground-control approach

noun

Aeronautics.
  1. a system in which an observer interprets radar observations of the position of an aircraft and transmits continuous instructions to its pilot for landing. GCA


Etymology

Origin of ground-controlled approach

First recorded in 1940–45

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