Electromechanical actuators are increasingly being used in aerospace, mainly due to the new design concept, the more electric aircraft (MEA), such as the Boeing 787, which uses electric power to directly operate some actuators, such as the brake system, to feed the hydraulic system, or to power systems that manage the onboard environment, making the aircraft bleed-less. In the most recent airbus aircrafts are used electric actuators for secondary systems, but for primary systems are used hybrid actuators, such as the Electro Hydrostatic Actuators (EHA), which use both electric power and local hydraulic power. Actuators are safety critical components, especially when used for systems of primary importance, and for this reason it is necessary to identify all possible faults associated with it and, if possible, assess the degraded state of the actuator to maintain a high level of safety.