MTU Aero Engines AG is engaged in the development, manufacture, and trade of aviation engine and components. It operates its business through two segments: Original Equipment Manufacturing, and Maintenance, Repair and Overhaul. The Original Equipment Manufacturing segment comprises commercial and military engine businesses. The Maintenance, Repair and Overhaul segment provides civil aircraft and military engine maintenance services. The company was founded by Karl Rapp in 1913 and is headquartered in Munich, Germany.