Model 400-X Feedback Control Loader System was designed to meet the world’s highest levels of certification from the JAA, FAA and military equivalents for rotary and fixed wing aircraft, but can be adapted for a variety of training simulation apparatus such as steering wheels, throttles, collectives, seat shakers and tillers. Utilizing minimal to zero backlash gearboxes in a variety of configurations in conjunction with DC brush type motors, friction and inertia are virtually zero and are not present in the flight controls. Our unique coupled-mass servo force-loop technology provides the technical foundation for all our systems. Combined with highly responsive electric actuators and sophisticated math software models, the 400-X Feedback Control Loader System provides the highest fidelity control loading anywhere. The aircraft control model is based on real aircraft data model. Any type of control system can be simulated: fully boosted, partially boosted or non-boosted. The spring rate and the damping can be varied so that the system can simulate the change in the force gradient and damping that is present with the change in dynamic pressure. Friction, stops, breakouts, boost actuators, non-linear gearing, non-linear hinge moments and auto-pilots (simulated and real) are available with this system. 400-X Feedback Control Loader System can be used with our 300-X Feedback Control Loader System and our full motion base platform product line to make a comprehensive and cohesive system for simulation training.