over there is one area referred to as "outer area" near course C airspace. As described by this AIM:

Though not requiring regulatory action, class C airspace locations have a procedural external Area. Typically this area is 20 NM native the primary course C airspace airport. That vertical limit extends from the lower boundaries of radio/radar coverage approximately the ceiling that the approach control"s delegated airspace, excluding the class C airspace itself, and also other airspace together appropriate. (This external area is not charted.)

As that is no charted and also there is no FAA regulations around outer area, I would think the could also be collection near course B or D airspaces. Why don"t any other airspaces but only class C airspace has actually the outer area?


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The course C outer area is the airspace surrounding course C airspace out to 20nm, and from the reduced limit of radar coverage to the top of the controller"s airspace. The external area is no charted, although you deserve to see in the white box (in the graph below) surrounding to course C airports the you have the right to initiate interaction within 20nm.

You are watching: The radius of the procedural outer area of class c airspace is normally

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ATC offers class C services (e.g., trip following) on a workload-permitting basis to participating aircraft operating in the external area, and aircraft in 2-way radio communication will receive IFR/VFR plane separation services.

So you deserve to think of class C airspace together 3 concentric rings: the 20nm outer area, the 10nm shelf area, and also the 5nm surface ar area.

Source target 3-2-4


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The outer area neighboring classy airspace is not actually class C airspace, yet a procedural area linked with the class C and not charted. See keep in mind 4 of target 3-2-4. This area is no considered course C airspace, but VFR flights making use of technique control or IFR flights inbound and also outbound the the course C room still under the regulate of strategy control because that that class C airspace.


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