Definition
The spacing of aircraft maintained by an air traffic controller using radar to ensure that each aircraft is kept a specified minimum distance from other aircraft, terrain, and obstacles.
Plain English
When a controller is watching aircraft on radar, they keep them a safe minimum distance apart from each other and from the ground or obstacles.
Context Anchor
Pilots encounter this term when receiving air traffic control services, especially during instrument flight, departures, arrivals, and operations in busy controlled airspace.
Derivation
Radar comes from 'Radio Detection and Ranging,' the system that lets controllers see aircraft positions on a screen. Separation means keeping things apart. Together: keeping aircraft apart by watching them on radar.
Why Pilots Care
It allows safe operation of multiple aircraft in the same airspace under ATC control and prevents mid-air conflicts.
Intuition Check
Do not read “separation” here as a casual idea of being apart. In air traffic control, it means required minimum spacing that a controller is actively applying and monitoring.
Example Sentence 1
Once we were handed off to Approach, the controller began providing radar separation from the arriving traffic ahead of us.
Example Sentence 2
Radar separation standards let more flights operate safely in the same terminal area during peak hours.