Rolls-Royce executives say they have completed ground and flight testing of a capability upgrade for the AE 1107C engine that powers the Marine Corps and Air Force tiltrotor V-22 Ospreys, but some work remains to update manuals and complete the Federal Aviation Administration's certification process. The design changes are part of a series of upgrades the company has developed to improve the performance of the engine and lengthen the time between maintenance, and they combine with the Block III turbine...
