Patent ID: 8827205

Claim:
An electromechanical and pneumomechanical linear actuator interconnected to a folding strut for moving retractable landing gear from a stowed configuration to a deployed configuration for landing which comprises: a stator forming a channel defining an axis; a ball screw received in the channel for rotation about the axis; a ball screw housing for engagement with the ball screw to establish a chamber, the chamber being between a distal end of the ball screw and a proximal portion of the ball screw housing, and the ball screw housing having a distal portion for receiving the ball screw in threaded engagement therewith to translate rotation of the ball screw into axial movement of the ball screw housing relative to the ball screw; an electromechanical means for rotating the ball screw to extend the ball screw housing; a clutch for disconnecting the electromechanical rotating means from the ball screw housing; a port formed on the ball screw housing, the port positioned on the proximal portion of the chamber; and a valve for selectively providing fluid communication between a pressurized fluid and the port to introduce the pressurized fluid into the proximal portion of the chamber to drive the ball screw housing away from the stator to move the folding strut of the landing gear from the stowed configuration to the deployed configuration.