When applying visual separation, what must the controller do?

When applying visual separation, it is essential for the controller to effectively communicate with the pilots regarding the position and intentions of nearby aircraft. This ensures that pilots are aware of potential conflicts and can take appropriate action to maintain safety and separation. By informing the pilot about the location of another aircraft, the controller facilitates the ability of the pilots to visually maintain separation on their own.

This communication plays a crucial role in allowing pilots to make informed decisions. It empowers them to look out for the traffic, anticipate crossing paths, and adjust their flight paths as needed, thus enhancing situational awareness and ensuring safety in a busy airspace.

The other elements, such as controlling both aircraft on the same frequency or instructing one to climb or descend, may be relevant in different contexts but are not specific requirements for applying visual separation. The focus here is primarily on ensuring awareness through clear communication about the relative positions and plans of nearby aircraft.