Rotary-wing aircrafts, under critical operating conditions, generally use the Stability Control Augmentation Systems (SCAS) to improve stability and manoeuvrability. While fixed-wing aircraft commonly use fly-by-wire systems as the basis for primary flight control, rotary-wing aircraft still primarily rely on hydraulic servosystems to control collective and cyclic pitch of the main rotor and the collective of the tail rotor. As technology has improved, the use of fly-by-wire systems in rotary-wing aircraft has spread to provide more efficient and safer aircraft that require less effort from the pilot to complete their missions. Briefly, the SCAS system is a circuit parallel to the hydraulic-mechanical system that provides the pilot assistance in manoeuvring the machine through electrical signals.