Abstract: A telescoping aerial refueling probe includes a second section and a ball screw. The first section is telescopically mounted to the second section. The ball screw is rotationally mounted along the longitudinal axis of the probe. A hydraulic motor rotates the ball screw to drive a ball screw nut and attached first section relative the second section. The hydraulic motor communicates with the hydraulic system and is operated in response to a control system. A backup motor such as an electric motor alternatively drives the ball screw upon failure of the hydraulic motor. As only the backup motor is required for redundancy, minimal additional weight is added to the probe and a relatively compact system is provided.

Abstract: An aircraft door is slidable along a door path between open and closed positions. The door is guided by one or more tracks. Riders carried by the door are engaged to the tracks. Each rider includes a roller held for rotation about a roller axis which is fixed relative to the door. Each roller axis extends generally horizontally and generally transverse to the track. Each track includes a first portion extending generally parallel to the aircraft fuselage and a second portion having a continuously curving transition to the first portion and extending partially inboard from the first portion. The second portion of the track guides the door into and out of the opening in the fuselage, allowing the door to achieve a substantially flush condition when in its closed position.