Inside a vast, 69,000-square-foot engine shop situated on the southern edge of the Cincinnati-Northern Kentucky International Airport (CVG), a small group of GE Aerospace mechanics and college co-op students huddle around a GEnx engine. An engineer is demonstrating how to use a prototype ultrasonic wrench. As the mechanics crane their necks to observe, the engineer deploys the vibrating wrench to loosen a specific type of bolt that can cause damage to a part in the engine’s combustion case if not handled properly.