Northrop Grumman has offered to replace the obsolete radar on the US Boeing B-52H Stratofortress strategic bombers with its AN/APG-83 active electronically scanned array (AESA) radar. The USAF wants to upgrade the entire B-52 fleet with a new radar system. It is looking at several options to satisfy its Radar Modernisation Programme to replace the B-52’s now obsolete Northrop Grumman AN/APQ-166 mechanically-scanned radar. The AN/APG-83 system is also known as the Scalable Agile Beam Radar (SABR). A version of SABR has been developed for the B-1B fleet. According to Northrop Grumman, SABR provides a reliable, cost-effective, off-the-shelf, low-risk radar upgrade solution for multiple platforms.