What requirement does Class C airspace impose on pilots before entry?

In order to enter Class C airspace, pilots are required to establish two-way communication with Air Traffic Control (ATC) before entering. This requirement is critical for ensuring that the ATC system can effectively manage the increased traffic and maintain safety in areas surrounding busy airports. Class C airspace typically extends from the surface to 4,000 feet above the airport elevation, and the communication ensures that pilots are aware of other aircraft in the vicinity and any advisories or instructions from ATC.

The requirement for communication with ATC helps maintain order within this airspace and allows for better separation between aircraft, reducing the risks of mid-air collisions. This proactive measure enhances situational awareness for both pilots and controllers, ensuring a safer operating environment.

Other options, while relevant to aviation procedures, do not specifically address the requirements for entry into Class C airspace. For example, submission of a flight plan is customary but not mandatory for entry into Class C. Approval from the airport manager is not required for pilots, and adherence to a specific altitude may apply in various airspaces but is not a prerequisite for entering Class C airspace.