this invention is shown in fig1 12 and 13 in lieu of the pit cover engaging the end of a stationary ramp fairing as in the embodiment of fig2 4 the embodiment of fig1 12 and 13 employs an extensible and retractable ramp fairing 64 the ramp fairing 64 is shown in fig1 in the extended position which it occupies during normal operation of the engine in this position the ramp fairing substantially covers the pit 24 and provides a surface for smooth flow of air through the bypass 20 when the thrust reversal operation is initiated the ramp fairing is retracted to the position shown in fig1 where it is substantially clear of the opening 14 and does not impede the flow of air therethrough thereby providing a fully effective thrust reversal operation the structure of this embodiment is shown in further detail in fig1 as shown in fig1 the ramp fairing 64 includes a plurality of segments three is the specific embodiment illustrated 64a 64b and 64c each of the segments 64a 64b and 64c is formed to include a flat portion 66 and the segments 64a and 64b include flanges 68a and 68b respectively extending upwardly at one end of the portion 66 the segments 64b and 64c are biased toward the extended position shown in fig1 and 13 by means of springs 70a 70b the ends 72 of each spring 70a 70b are connected to the flange 68 of one segment and the center of the spring presses against the flange 68 of the adjacent segment as.