Patent ID: 11873092
Assignee: THE BOEING COMPANY
Field: Transport (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 18:
19. A trim actuator for a horizontal stabilizer of an aircraft, the trim actuator comprising:
a rotatable power screw;
a flange, concentric with the power screw and fixed to the power screw so that the flange rotates with the power screw;
a nut, configured to translate along the power screw when the power screw is rotated;
an anti-back-drive mechanism, configured to prevent the power screw from rotating in a first rotational direction when a first force is applied to the nut in a first axial direction along the power screw and also configured to prevent the power screw from rotating in a second rotational direction, opposite the first rotational direction, when a second force is applied to the nut in a second axial direction, opposite the first axial direction;
a plurality of locking teeth, located circumferentially on the flange; and
a locking lever, configured to selectively prevent the power screw from rotating in the first rotational direction and in the second rotational direction when the locking lever engages the plurality of locking teeth.