When entering Class Delta airspace, what type of communication is required?

When entering Class Delta airspace, establishing two-way radio communication with the tower is required. Class Delta airspace is typically associated with airports that have an operational control tower, and the communication protocol is designed to ensure safe and efficient operations within that airspace.

When you establish two-way communication with the control tower, you effectively inform them of your intentions, which helps manage traffic both in the air and on the ground. This requirement allows the tower to provide crucial information, such as traffic advisories and instructions, ensuring that pilots are aware of the surrounding environment and can operate safely.

While other options may imply certain types of communication or actions, they do not meet the specific regulatory requirement for operating in Class Delta airspace. For example, merely relying on ground control or using transponder mode C without the necessary radio communication would not sufficiently accommodate the safety protocols in place for traffic management in those environments. Thus, the requirement for two-way communication with the tower stands as a safety measure and regulatory necessity.