Abstract: Control apparatus of the kind disclosed in UK patent specification Nos. 2,073,887 and 2,114,717, i.e. in which a movable operating member, arranged to control associated apparatus such as an aircraft engine, is coupled to an electric stepper motor, the motor being energizable to move the operating member and/or to generate a `feel` resistance to, or detents in, the manual movement of the operating member, the apparatus including a ball-screw assembly comprising a lead-screw and ball-nut, one of which is connected to the operating member and, with the operating member, is linearly movable with respect to the other, the stepper motor being coupled to the ball-screw assembly so that rotation of the motor rotor produces, or is produced by, relative rotation of the lead-screw and ball-nut.

Abstract: A cabinet (1) for stowage of electronic printed circuit boards (2,3,4) for example, is adapted for permanent installation in a vehicle structure by allowing the boards to be readily removable. The cabinet can thus be readily cooled by both air and fluid jackets (10,13, and 13,12) which are permanently connected to different sources of cooling flow.