their downstream and upstream ends by link rods 42 whose ends are articulated on the upstream portion 24 and downstream portion 26 about horizontal transverse axes 34 36 and 38 40 respectively so as to form an articulated quadrilateral in the embodiment shown in the drawings the link rods 42 have the same length and therefore form a deformable parallelogram a hydraulic or electric actuator 44 comprising a cylinder 46 and a piston rod 48 is mounted between the opposite articulation axes 34 40 of the parallelogram one end of the cylinder being articulated on the articulation axis 40 of the downstream portion 26 of the pylon 12 while one end of the piston rod 48 is articulated on the articulation axis 34 of the upstream portion 24 of the pylon 12 this installation making it possible to change the position of the engine relative to the wing on the ground and in flight during the operation of the turbomachine 10 there are several flight phases during which the distance between the turbomachine 10 and the wing 14 must be changed when stationary and during takeoff the actuator makes it possible to keep the turbomachine 10 in a high position in order to maintain a maximal turbomachine ground distance.