Automatic restow system for aircraft thrust reverser

Abstract

An actuation activation system for an aircraft engine thrust reverser system is provided including an improved locking actuator (,), a sleeve sensor mechanism, and auto-restow control logic. The locking actuator (,) includes a lever (,) corresponding to whether the actuator is locked or unlocked. A slide-by first proximity sensor (,) is positioned near the lever and set to normally far and triggering near. The first proximity sensor produces a first trigger signal for use in the auto-restow control logic. The sensor mechanism includes a second slide-by proximity sensor and a target in communication with a thrust reverser translating sleeve. The second sensor is connected to the forward side of an engine torque box. A preferred embodiment sensor mechanism (,) is provided and includes a pivotable target arm (,) having a proximal end (,), a distal end (,), and a middle portion pivotably connected to fixed engine structure, preferably torque box (,). The mechanism (,) includes a proximity sensor (,) connected to the torque box (,) at a location near the target arm distal end (,). The sensor (,) is set to normally far, triggering near. Rotation of the target arm causes its distal end to become positioned in front of the proximity sensor switch. The auto-restow control logic is in communication with the first and second proximity sensors. The logic commands the thrust reversers system to restow upon receipt of a trigger signal from either the first or the second proximity sensors. An improved locking actuator is provided including a lead screw nut (,) having a shoulder (,) that provides a secondary locking mechanism for the actuator piston (,).