early warning

caution or warning which appears before the expected or usual time

An Airborne Early Warning (AEW) system is a radar system carried by an aircraft which is designed to detect other aircraft. Used at a high altitude, the radars allow the operators to distinguish between friendly and hostile aircraft hundreds of miles away.AEW aircraft are used for defensive and offensive air operations. The system is used offensively to direct fighters to their target locations, and defensively to counter attacks. Many countries have their own AEW systems, although the E-3 Sentry and Grumman E-2C Hawkeye are the popular systems worldwide. The Sentry was built by the Boeing Defense and Space Group (now Integrated Defense Systems) and is widely considered to be an international benchmark for AEW systems. It is based on the Boeing 707 aircraft. The E-2 Hawkeye, which entered service in 1965, is arguably the most widely used AEW system. The E-3 Sentry is not strictly an AEW system, as it has far more functionality—see Airborne Warning and Control System. For the Japan Air Self-Defense Force, the E-3 technology has been fitted into the Boeing E-767.
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Early notification of the launch or approach of unknown weapons or weapons carriers. Also called "air defence early warning". 1/3/81

Premier avis du lancement ou de l'approche d'armes ou de vecteurs d'armes non identifiés. Aussi appelé "alerte lointaine de défense aérienne"; "pré-alerte". 1/3/81

Voir alerte lointaine. 1/9/81

Voir alerte lointaine. 1/3/81

early warning
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