Thrust reverser actuating system in a turbojet engine

The thrust reversal system, comprising grids with sliding covers (6) in the engine nacelles, and shutters to deflect a by-pass air flow towards the grids, has the covers actuated by drives (30) in line with the axes of the slideways (14a, 14b, 14c) guiding the cover edges. Each slideway has an outer wall (21) connected to a fixed structure of the engine nacelle and a channel containing an elongated body (24) attached to the edge of a cover (6). The drive is in the form of a screw (31) engaging with the body, turned by an electric, pneumatic or hydraulic motor (32) to move the cover in a lengthwise direction.