Saab 340 AEW&C

The Saab 340 AEW&C is a Swedish airborne early warning and control aircraft, a military variant of the Saab 340 airliner that the Swedish Air Force designated the S 100B Argus. Its core is the Erieye system, a fixed PS-890 active electronically scanned array radar carried above the fuselage. Unlike the rotating dish of the American E-3 Sentry and the Beriev A-50, it causes less drag but leaves a blind zone directly ahead of and behind the aircraft, with a scan of 120 degrees on either side. The radar can track ships, aircraft and missiles at 300 to 400 kilometres from an altitude of about 6,100 metres. Six S 100B aircraft were built for Sweden, four permanently fitted with the radar and two for transport, and two were upgraded as the S 100D Argus, which entered service in 2009.