Many Class C airspaces do not have a full-time tower and the airspace reverts to Class E or G when the tower is closed.
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When the airport closes, we call the area control centre responsible for the surrounding airspace, and they take over responsibility. In addition, the control zone and TMA actually seize to exist when local ATC is closed, so they both become class G airspace.
Class C Airspace Standards:They will have Ground Control, Tower, and Approach Control. Approach Control typically controls an area 20-30 miles from the airport, yet you only LEGALLY need to talk to them if you are entering into Class C airspace.
The CTAF is clearly labeled on aeronautical charts for every airport. It's shown with a C in a solid circle appearing after the CT (Control Tower), UNICOM, or MULTICOM frequency. At towered airports, the CTAF will be listed because it is used after a part-time tower closes for the night.
Class C airspace never requires a separate clearance. If you are in two-way communications with the controlling facility, you satisfy the requirements for authorization through Class C airspace.
Like most controlled airspace, ALL pilots must notify and receive approval from the FAA to fly in Class C airspace. Pilots must also follow the necessary procedure to receive permission.
Class C Airspace (Mandatory Radar)A shelf area with an outer radius of 10 nautical miles surrounds the core area. It extends from 1200 feet AGL to 4000 feet AGL. The airspace is depicted on charts as 2 concentric magenta circles.
If the airport of departure and arrival, and the route flown, are all in uncontrolled airspace, no ATC contact is needed. Your location will determine whether or not you need to contact Air Traffic Control. If you are within an airport traffic area that has a control tower, you'll need to contact atc.
Class C service requires pilots to establish two-way radio communications before entering Class C airspace. If the controller responds to a radio call with, “(a/c call sign) standby,” radio communications have been established and the pilot can enter Class C airspace.