The Boeing Company

Barry D Hance

Timothy J Soderquist

Christopher D Feet

Yonas T Meshesha

Kevin B Eck

Derek M Joseph

Patrick Joseph McCormick

Mark William Lesyna

Patrick M Fahey

Paul R Smith

Matthew D Uhlman

Christopher P Beamis

Robert J Hawk

Ellen A Pifer

Ali Abdelmagid

Herbert Guttler

A vehicle control surface, such as an aircraft horizontal stabilizer, is hydraulically controlled using solenoid operated valves (SOVs) controlling directional control valves and/or rate control valves with small numbers of ports, e.g. a four port three position directional control value and/or a four port two position rate control valve.

Horizontal stabilizer trim actuator systems and methods

A hydraulic system (e.g., of an aircraft or other vehicle) includes a pump, a pressure line coupled to the pump and configured to distribute pressurized hydraulic fluid, and a return line configured to return hydraulic fluid to a reservoir. The hydraulic system also includes an auxiliary leakage valve coupled to the pressure line, to the return line, and to an actuator. The auxiliary leakage valve is configured to receive a control signal and, based on the control signal, selectively open a restricted fluid path. The restricted fluid path couples the pressure line to the return line to allow a restricted amount of the hydraulic fluid to flow from the pressure line to the return line.

Hydraulic fluid warming system and method

Systems and methods are provided for a hydraulic stabilizer trim actuator (HSTA). The HSTA may operate one or more movable control surfaces. The HSTA operate responsive to commands issued by the pilot and/or by a controller and may include hydraulic architecture that minimizes the probability of an un-commanded movement or movement in the opposite direction of such commands.

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Woodinville, WA, United States of America

Barry D Hance