Abstract: This invention relates to a system for controlling the high-lift flaps of an aircraft subjected to the blast of at least one engine. The system includes reversible hydraulic jacks for actuating the flaps arranged so that each flap is actuated by a jack and each of the two chambers of one jack are connected to the corresponding chamber of the other jack, as well as to an orifice in a hydraulic fluid distributing unit, so that the supply and exhaust of the corresponding chambers of the jacks are respectively simultaneous. The high-lift flaps are connected by a mechanical torsional connection which allows a dissymetry of position of the high-lift flaps in extended position. A safety system is also provided to block the high-lift flaps in position as soon as the extent of dissymetry of position between the high-lift flaps in extended position reaches a predetermined threshold.

Abstract: This invention relates to a system for controlling an aerodynamic surface mounted mobile on an aircraft so as to be able to pivot freely about a fixed axis and provided with a tab itself articulated on the trailing edge of the aerodynamic surface, the system being such that elastic connecting devices are provided between the tab and the aerodynamic surface and the tab can be directly actuated by the pilot, via a voluntary actuating member and a mechanical linkage. According to the invention, this system comprises: an actuator interposed between the elastic connecting device and the aerodynamic surface; a device for controlling the actuator; and a clutch connecting the structure of the aircraft to the mechanical linkage; and the device for controlling the actuator also controls the clutch, so that the latter is in disengaged position when the actuator is active and in engaged position when the actuator is inactive.