What must all operations within Class C airspace ensure?

All operations within Class C airspace must ensure communication with the responsible ATC facility. This is crucial for maintaining safety and managing traffic in busy airspace areas where multiple aircraft operate. Class C airspace typically surrounds airports with moderate to high traffic levels, and effective communication ensures that aircraft can receive timely instructions, advisories, and traffic information from air traffic control. Pilots must establish two-way radio communication with the ATC facility before entering Class C airspace and maintain this communication throughout their operations in that airspace.

While other factors, such as having a transponder and potentially filing a flight plan, are important for certain operations, the primary requirement for flying in Class C airspace is establishing communication with ATC. This helps create a safer environment by allowing the control tower to manage aircraft movements effectively and reduce the risk of conflicts and accidents in the airspace.