A prototype has been in flight test since late 2005. Irbis-E can detect and track up to 30 airborne targets at one time at ranges near 350~400 kilometers, and attack up to 8. In air-to-surface mode the Irbis-E provides mapping allowing to attack four surface targets with precision-guided weapons while scanning the horizon searching for airborne threats that can be engaged using active radar homing missiles. It can detect a target with radar cross-section (RCS) 3m2 at up to 400 km, (towards each other, in an area of 100 square degrees) while a target with RCS 0.01m2 at up to 90 km.(dead link)  It is one of the most powerful PESA radar used in an operational aircraft.