Abstract: A flight control limiting system for a rotary-wing aircraft which generates servo-commands for at least one of a main rotor and a tail rotor. A set of first commands represents the position of at least one flight control which is movable between extreme positions, and may be controlled by the pilot. A set of second commands are generated by a flying aid system. The flight control limiting system limits the values of the set of second commands when the position of any of the flight controls is close to an extreme position, so that the servo-commands for that particular flight control corresponds to the set of first commands.

Abstract: A cyclic stick system for a helicopter includes sensors for measuring at least one parameter representative of the current flight status of the helicopter. In response to the at least one parameter, the cyclic stick system either (1) continuously and automatically recenters the forces on the cyclic stick, thus canceling out the residual static forces, or (2) allows the pilot fully to feel the countering action of the elastic return device on the cyclic stick.

Abstract: A rudder bar system for a helicopter controlled in yaw by acting on the tail rotor or an equivalent device has a capability, as a function of the parameters representative of the current flight status of the helicopter, of either automatically continuously recentering the forces on the rudder bar, which cancels out the residual static forces and gives the pilot a tactile sensation close to that given by a friction-type rudder bar, or allowing the pilot fully to feel the countering action of an elastic return device such as a spring.