Abstract: The invention relates to a linking assembly between a mechanical system, such as an aircraft seat, and an adjustment actuator, comprising an input shaft connected to an output of the actuator and an output shaft connected to an input of the mechanical system, and engagement/disengagement members placed between the input shaft and the output shaft, the members being mobile between a locked position, wherein the input shaft and the output shaft cooperate in rotation, and an unlocked position, position-copying means being mounted solidly attached to the actuator, the copying means having an input shaft, a position-copying rod being fixed between the output shaft and the input shaft of the copying means.