The Boeing Company

Derek M Joseph

Christopher D Feet

Timothy J Soderquist

Barry D Hance

Kevin B Eck

Yonas T Meshesha

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

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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Saint Louis, MO, United States of America

Derek M Joseph