Definition
A long-range radar system used by Air Route Traffic Control Centers (ARTCCs) to detect and display aircraft positions over large areas of airspace, primarily for en route air traffic control between airports rather than near them.
Plain English
A powerful, long-reach radar that the controllers handling cross-country traffic use to see where aircraft are while flying between airports.
Context Anchor
You may see ARSR mentioned in FAA glossary material, air traffic control discussions, and explanations of how controllers monitor aircraft outside the local airport area.
Derivation
‘Surveillance’ comes from the French ‘surveiller,’ meaning ‘to watch over.’ Pairing it with ‘air route’ tells you the radar’s job: watching over aircraft as they travel along high-altitude routes between airports, not while they are landing or departing.
Why Pilots Care
It supplies the radar data controllers need to provide separation, traffic advisories, and routing instructions outside terminal radar range.
Intuition Check
ARSR is not radar carried in your airplane. It is radar on the ground, used by air traffic control.
Example Sentence 1
Once we leveled off at cruise, Center began tracking us on ARSR and handed us off to the next sector when we crossed the boundary.
Example Sentence 2
ARSR coverage allowed the center to maintain radar contact with our flight until we reached the next terminal area.