airspace Class C

Airspace in which both IFR (instrument flight rules) and VFR (visual flight rules) flights are permitted, subject to air traffic control service. IFR flights are separated from other IFR and VFR flights. VFR flights are separated from IFR flights and receive traffic information about other VFR flights. Each person must establish twoway radio communications with the ATC (air traffic control) facility providing air traffic services prior to entering the airspace and thereafter maintain those communications while within the airspace. VFR aircraft are only separated from IFR aircraft within the airspace. Generally, it is that airspace from the surface to 4000 ft above the airport elevation charted in MSL (mean sea level), surrounding those airports that have an operational control tower, are serviced by a radar approach control, and have a certain number of IFR operations or passenger boardings. Although configuration of each Class C airspace is individually tailored, the airspace usually consists of a 5 NM radius core surface area and extends from a 1200- to 4000-ft elevation. The outer area extends outward from the primary airport and from the lower limit of radar/radio coverage up to the ceiling of approach control’s delegated airspace, excluding the Class C airspace and other airspace as appropriate. Formerly known as ARSA, or airport radar service area. Class C airspace is charted on sectional charts, IFR en route low-altitude charts, and terminal area charts where appropriate.
Class C airspace is depicted in magenta color on sectional charts.

Aviation dictionary. 2014.

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