Aircraft gas turbine comprising an engine cowling which has a rear area, with respect to the direction of the current, that has a thrust-reverser device, wherein the rear area is embodied in such a way as to be translatable in the axial direction, characterized in that the rear area is mounted in a translatable manner on two rails that are arranged in parallel to each other and that it comprises respectively one gear rack mounted on each rail, with the gear rack being in mesh with one cog wheel, respectively, which is respectively coupled to a common motor via a gear unit