What is the typical radius of the outer rings of Class C airspace?

The typical radius of the outer rings of Class C airspace is indeed 10 nautical miles (NM) from the airport. Class C airspace is designed to manage aircraft operations in busy airport environments, providing a controlled airspace structure around airports that handle a significant volume of traffic.

The Class C airspace consists of two main components: an inner core, which has a radius of 5 NM, and an outer ring, which extends outward to a radius of 10 NM. This configuration allows air traffic control to provide services to both the arriving and departing aircraft within the vicinity of the airport while providing enough buffer space for other air traffic in the surrounding area.

This 10 NM radius effectively balances the need to manage air traffic efficiently while allowing for safe operation of both commercial and general aviation flights. The 20 NM option is not applicable for Class C, as this more extensive range typically refers to an outer area common to Class B airspace instead.