Patent ID: 8684314
Filing Date: 2014-04-01
Classification: B64C,Y02T

Abstract:
1. An emergency piloting method for a manual flight control system of an aircraft, the manual flight control system being arranged to include from upstream to downstream, at least: a manual flight control device, intermediate mechanical connections for control transmission, and an airfoil surface for changing the flight attitude of the aircraft; the method providing at least one intermediate mechanical connection that is arranged to include a mechanical terminal transmission with an input pivoting quadrant upstream therefrom, at its upstream end, an output pivoting quadrant at its downstream end, and at least one flexible connection means, and that is arranged for said manual flight control system that includes at least one centering rod to be provided with at least one series actuator coupled to an electronic control unit, wherein said mechanical terminal transmission is arranged to include towards the downstream end, at least one series actuator in parallel with at least one centering rod, said output pivoting quadrant possessing at least two distinct off-center pivoting hinges; one of these hinges being an off-center hinge for transmitting control to said airfoil surface so that said airfoil surface is under the authority of said system, the method making provision for using said off-center control transmission hinge to connect said series actuator to the output pivoting quadrant, while another off-center hinge, which is an emergency centering hinge is arranged to connect said centering rod to the output pivoting quadrant; and wherein in the event of a breakage of said flexible connection means, the upstream control device takes authority over the electronic control unit of the series actuator, while the output pivoting quadrant is subjected by said centering rod to a centering action, such that said output pivoting quadrant forms a bearing point for the series actuator, and emergency control is transmitted from the control device to the electronic control unit in such a manner as to actuate the airfoil surface downstream.