41. The dovetail blade-root connection and the spline coupling of gas turbine aero engines experience fretting. 42. The VariViggen is powered by a 150 hp Lycoming O-320 aero engine in pusher configuration. 43. By the late 1920s, aero engines made up most of Rolls-Royce's business. 44. In November 1909 it was announced they had designed aero engines and were seriously considering their manufacture. 45. In 1961, No . 1 AD ceased airframe maintenance, but continued to service aero engines . 46. CFM International and International Aero Engines are still competing for the engine order to power the Northwest planes. 47. America West also has a firm order for 12 A320 planes powered by the International Aero Engine V2500. 48. As well as a prolific aircraft builder, de Havilland was also a significant producer of aero engines . 49. The engine final assembly line is located at MTU Aero Engines at their location in Hanover, Germany. 50. The Liberty aero engine with its expensive drawn-steel cylinders was redesigned with cheaper cast iron cylinders.
