Definition
A means employed by ATC to separate aircraft in terminal areas and en route airspace in the NAS. There are two methods employed to effect this separation: the tower controller sees the aircraft involved and issues instructions, as necessary, to ensure that the aircraft avoid each other; or a pilot sees the other aircraft involved and upon instructions from the controller provides separation by maneuvering the aircraft as necessary to avoid it. When pilots accept responsibility to maintain visual separation, they must maintain constant visual surveillance and not pass the other aircraft until it is no longer a factor.
Plain English
A way of keeping aircraft safely apart by using eyesight rather than radar distances or altitudes alone. Either the controller watches the aircraft from the tower and gives instructions to keep them apart, or the pilot spots the other aircraft and agrees to stay clear of it while ATC monitors.
Context Anchor
You may hear this in radio instructions near airports or in busy controlled airspace, especially when a controller says to maintain visual separation from another aircraft.
Derivation
“Visual” comes from a Latin word meaning “to see.” “Separation” comes from a Latin word meaning “to set apart.” Together, the words point to the aviation meaning: keeping aircraft apart by seeing where they are.
Why Pilots Care
It lets pilots fly closer together in good visibility, speeds up traffic flow, and reduces the need for constant controller radar vectors.
Grounding Statement
The key point is that visual separation depends on continuous sight of the other aircraft, not just knowing it is nearby.
Intuition Check
Visual separation does not mean you simply saw another aircraft once. It means an approved way of keeping aircraft apart, where the controller or pilot must actually keep the aircraft in sight and safely separated.
Example Sentence 1
Cessna 23A, traffic eleven o'clock, two miles, a Cherokee at two thousand five hundred -- report in sight for visual separation.
Example Sentence 2
The pilot maintained visual separation while following a slower aircraft into the pattern.