Abstract: A flow control system selectively operable to either invert the relative position of first and second coaxially flowing fluid streams or to combine the two fluid streams for discharge as a single annular fluid stream is disclosed. The system includes a longitudinally extending input transition section which is partitioned into separate flow passages that receive sectorial regions of the first and second annular fluid streams and redirect the fluid streams into a segmented annular flow pattern in which portions of the first and second fluid streams form circumferentially extending annular sectors that are interspersed in circumferential alternation. Fluid exiting the input transition section flows into a longitudinally extending valve section having entrance and exit openings of geometry substantially identical to the segmented annular exit opening of the input transition section.

Abstract: An aircraft engine installation is disclosed wherein a gas turbine engine is supported within the interior of a tubular cowling that is affixed to the aircraft and all other components of the engine installation such as an air inlet and exhaust system structurally depend from the cowling rather than being mounted to the gas turbine engine. To permit access to the engine for inspection, repair or removal. the lower portion of the cowling is linked to a stationary upper portion of the cowling by a set of jackscrew assemblies spaced apart along each axial boundary of the upper and lower cowling units. The jackscrew assemblies are operable to lower the lower cowling unit to a position at which integral locks, included in one set of the jackscrews, can be released to permit the lower cowling unit to be swung open about integral hinges that are included in the second set of jackscrews.