Abstract: A flight control surface actuation system is provided in which a plurality of actuators (6-13) are connected to one another in order to synchronize their operation. Each actuator has its own gearbox such that the torque transmitted in the synchronizing element is kept low.

Abstract: A lock for an engine thrust reverser comprises a latch member (2) that cooperates with a thrust reverser door to keep it closed. An actuator plunger (9) moves longitudinally to cooperate with the latch member (2) to hold it against movement that would allow the door to open. Either a sleeve (12) is located longitudinally on the plunger (9) so that opposite lateral sides thereof are engaged between the latch member (2) and a fixed abutment (13) to hold the door closed, or the plunger controls a pivoted pawl (32) that is loaded in compression by the latch member (2) when under a door-opening load.

Abstract: A linear cable laying engine has a pair of endless belts (12,14) having a substantial length (16,18) in respective face to face opposition, and means for applying force to the belts to cause them to grip a cable (42) between the opposed faces.

Abstract: A tank for propellant in a space vehicle includes a trap defined by two walls which are substantially permeable to liquid but not to vapour. One wall (16) allows liquid to flow into the trap. The other (7,8) allows liquid to flow out via an outlet port. Vapour in the trap escapes via a vent (19,20). The wall (16) which allows liquid to flow to the outlet include a plurality of plates (1) clamped together. The surfaces (9) of the plates (1) are grooved such that plate surfaces engage to form fine passages (10) permeable to liquid but not vapour.

Abstract: A fluid-pressure-operable actuator system, for operating an aerodynamic control surface, including an actuator comprising a casing, piston and output member. Annular sealing means carried by the piston sealingly engages with the casing while annular sealing means disposed in an aperture through which the output member extends sealingly engages that member. Bearing means circumferentially flank the sealing means of the piston and/or the aperture and include parts of readily- and locally-deformable material, respectively in relatively-slidable load-bearing engagement with the casing and/or the output member. In the event that damage is sustained by the surface of the actuator engaged by the sealing means the bearing means is sufficiently deformed as to permit relative movement of the casing and output member to continue under the power of at least one other actuator associated with said control surface.

Abstract: A frictional drive unit, suitable for effecting linear sliding movement of a structural member into a cantilevered position, includes a frame, at least two sprocket assemblies mounted in bearings in the frame and spaced apart with their rotational axes parallel to each other, and an endless track. This track comprises a plurality of articulated friction pads mounted upon the sprocket assemblies and drivingly engageable with the structural member. Reversible motor means is carried by the frame and is drivingly connected to at least one of the sprocket assemblies.