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In an aircraft, a fuselage having a tail portion, said tail portion including a stabilizer, a control surface pivotally mounted upon said stabilizer, a tab pivotally mounted upon said control surface, actuating mechanism for deflecting said tab for the actuation of said control surface, deformation sensing means including a cable anchored to said fuselage at each of its ends at vertically spaced points above and below the centre of gravity of the aircraft, said cable having an intermediate portion operatively connected to said tab actuating mechanism whereby deformation of said fuselage initiates relative movement of said cable and corrective movement of said tab and said control surface.