What is the correct phraseology to authorize visual separation between arriving and departing IFR aircraft?

The correct phraseology for authorizing visual separation between arriving and departing IFR aircraft is to clearly indicate that visual separation is being "cleared" between the specified aircraft. When the phrase includes the term "cleared," it not only conveys permission for the aircraft to maintain visual separation but also aligns with established air traffic control procedures. This ensures that the pilots understand they have the authority to separate based on visual reference, which is critical for maintaining safety.

Clear communication is a fundamental aspect of air traffic control, and using the term "cleared" denotes that both the controller and the pilots have a mutual understanding of the separation task that they are undertaking. It enhances situational awareness and confirms that visual separation is a controlled maneuver authorized by the controller.

In contrast, the other phrases do not accurately reflect the standard phraseology used in air traffic management, which could lead to misunderstandings or improper execution of separation protocols. For example, using "approved" or "authorized" may imply permission without the necessary clarity that "cleared" provides, which can be essential in a busy airspace environment. Phraseology consistency is vital for safety and operational efficiency.