Airborne interception radar

Airborne interception radar, or AI, was the Royal Air Force (RAF) term for radar systems used to equip aircraft in the air-to-air role. These radars are used primarily by RAF and Fleet Air Arm night fighters and interceptors for locating and tracking other aircraft, although most AI radars could also be used in a number of secondary roles as well. The term was sometimes used generically for similar radars used in other countries as well.