Patent ID: 7883054

Claim:
An actuator structured so as to be suitable for causing movement of an aircraft component which in use may flex, said actuator comprising first and second linear motion devices, wherein the first linear motion device comprises a first linear screw, a first nut, and a first prime mover arranged to impart relative linear motion between the first linear screw and the first nut, the second linear motion device comprises a second linear screw, a second nut, and a second prime mover arranged to impart relative linear motion between the second linear screw and the second nut, the actuator is arranged to be extended as a result of relative linear motion between the first linear screw and the first nut or relative linear motion between the second linear screw and the second nut, the first and second linear motion devices are arranged such that jamming of one of the first and second linear motion devices does not preclude operation of the other of the first and second linear motion devices, and the first linear motion device is back-driveable.