Raytheon on Aug. 1 test-fired its GPS-guided 155mm XM982 Excalibur artillery shell with a new inertial measurement unit (IMU), hitting all nine targets in a trial at Yuma Proving Ground, Ariz., company officials said.
The Excalibur rounds “had an average impact distance of less than two meters versus a threshold requirement of 10 meters,” said Michelle Lohmeier, Raytheon’s deputy program manger, land combat product line.
The new IMUs, built by Atlantic Inertial Systems, Plymouth, England, were added over the past several weeks after reliability failures with the previous Honeywell-built IMUs.
The old IMUs had a failure rate of about 5% and new Excalibur buys are on hold until the issue is resolved. The Army says no combat rounds have had the problem.