What is the vertical extension of the core area of Class C airspace?

The vertical extension of the core area of Class C airspace is from the surface level up to 4000 feet above ground level (AGL). This specification is crucial because it defines the area where various flight rules apply and where controlled airspace begins. Class C airspace is designed to accommodate airport operations that include a substantial amount of traffic, requiring specific communication and procedural rules to ensure safety and efficiency.

Understanding the boundaries of Class C airspace is essential for pilots, as they need to know when to establish communication with air traffic control (ATC) and adhere to the related regulations. The choice of 4000 feet AGL reflects the operational needs of the surrounding areas and the requirements for safe separation between aircraft approaching and departing from the airport within that airspace classification.

Other options are not aligned with the established dimensions outlined by the FAA (Federal Aviation Administration). For example, the choice stating a surface to 3000 AGL would not encompass the full vertical limit, while options suggesting higher altitudes such as 5000 AGL further extend beyond the designated boundaries of Class C airspace. Therefore, the specification of the vertical extension as surface to 4000 AGL accurately captures the designated range for the core area.