Abstract: A bypass valve door includes a pivotable first end, a second end, and an inner surface for facing fluid flow in a bypass valve system. The door includes a seal seat extending obliquely from the door second end. In a preferred embodiment, both the door seal seat and first end are configured for providing seals with adjacent stationary structures when the door is positioned in a closed position. When the door is positioned in an open position, the inner surface is configured for providing an aerodynamically smooth fluid boundary with structures adjacent thereto.

Abstract: A bypass duct outer cowl includes a fixed cascade disposed between axially spaced fixed cowl portions and a translatable cowl sleeve and blocker doors movably disposed on the respective radially outer and inner sides of the cascade. Actuation and linkage structure located entirely within the outer cowl provides for selectively moving the cowl sleeve rearwardly and rotating the blocker doors to a position across the bypass duct to cause the fan airflow to pass through the cascade in a thrust-reversing manner.

Abstract: A variable area exhaust nozzle is provided with seals between adjacent flaps to minimize flow loss therebetween when the flaps are modulated between minimum and maximum nozzle area positions. The overlapping seals is linked to the adjacent flaps by means of a bellcrank which operates to maintain the seal in a centered position between the flaps. A circumferential track is provided on the flaps to stabilize the seal in the axial direction.