This course covers trim, yaw dampers and flight envelope protection systems. The course discusses the purpose of a trim system, which is to provide a stable flight condition by removing residual forces in the flight controls caused by the deflections of the control surfaces necessary to achieve that exact flight condition. The course also discusses the layout of a trim system for each control axis used on a typical medium turboprop aircraft and how the trim tabs are controlled from the cockpit to maintain a fixed relationship to the control surface even when it is moved.