5 in the thrust reversal situation illustrated in fig9 the thrust reverser cowling 11 and the outlet jet pipe nozzle 13 have each slid downstream from the deflection grids 19 causing pivoting of the thrust reversal flaps 15 across the secondary flow vein 5 causing deflection of the secondary air flow 7 through the grids 19 outwards and towards the upstream portion of the nacelle in the following we shall endeavour to describe in more detail the mechanism according to the invention giving the possibility of passing from the position of fig1 to the position of fig9 as this is visible in fig3 the inner thrust reverser cowling 11 is connected to the fixed inner structure 1 via a longitudinal spar 25 defining a first slide 27 inside which a first longitudinal slider 29 may slide the outlet nozzle 13 is as for it secured to a second longitudinal slide 31 inside which a second longitudinal slider 33 may slide itself firmly attached to the first longitudinal slider 29 along this second slide 31 extends a rack 35 capable of cooperating with a pinion 37 mounted on the shaft 39 of an engine 41 itself attached on an extension 43 of the spar 25 as this is notably visible in fig3 and 4 it should be noted that the assembly for guiding the vfn may be inverted i e the slide may be integrated to the first longitudinal slider 29 instead of the longitudinal slider 33 in this configuration the driving by the pinion 37 may be accomplished in the upper plane of the axis of the slide also the rack and pinion assembly may be placed in a location other than the slide slider system like the side structure of.