What is the inner ring dimension of Class C airspace?

The inner ring dimension of Class C airspace is defined as extending 5 statute miles from the airport, from the surface up to 4,000 feet above ground level (AGL). Class C airspace is designed to contain a significant amount of air traffic and to provide separation between IFR (Instrument Flight Rules) and VFR (Visual Flight Rules) traffic. The specific dimensions help ensure that aircraft operating in the crowded airspace near busy airports can be safely managed. The 5 SM radius allows for sufficient area to accommodate arriving and departing aircraft while maintaining safety margins for both IFR and VFR operations.

This definition aligns with the regulations established by the Federal Aviation Administration (FAA) and reflects the operational needs at Class C facilities. Understanding these dimensions is crucial for pilots operating in or near Class C airspace, as it informs them of the requirements for communication and navigation in these airspaces.