Abstract: A monitoring apparatus for monitoring operation of a no-back device of an actuator assembly driven by a motor, the apparatus comprising sensor device operable to sense an operating parameter of the motor for determining when the motor's output drive is in a direction opposite to a selected direction of motor output drive.

Abstract: A monitoring apparatus for monitoring operation of a no-back device of an actuator assembly driven by a motor, the apparatus comprising sensor means operable to sense an operating parameter of the motor for determining when the motor's output drive is in a direction opposite to a selected direction of motor output drive.

Abstract: A lock has a shaft coupled to a flexible shaft which synchronizes hydraulic actuators of a translating cowl thrust reverser. The shaft is provided with a rotary brake comprising axially movable rotating and fixed discs urged together by a spring. The rotating discs are rotationally fixed to an armature of a solenoid which, when actuated, releases the rotary brake to allow the shaft to rotate and the thrust reverser to be deployed or stowed.

Abstract: A geared rotary actuator comprises at least two axially aligned compound epicyclic gear trains driven by an input shaft so that output ring gears in each train rotate relatively. Sun gears in adjacent gear trains are drivingly coupled to the input shaft through a differential device which permits limited rotational displacement between the sun gears. An element, for example an aircraft lift control surface, may be mounted on one set of the ring gears by means of spindles which extend normally of a plane which includes the axes of the ring gears, so that as a result of stresses therein the element may tilt locally about the spindles.

Abstract: A geared rotary actuator comprises at least two axially aligned compound epicyclic gear trains driven by an input shaft so that output ring gears in each train rotate relatively. Sun gears in adjacent gear trains are drivingly coupled to the input shaft through a differential device which permits limited rotational displacement between the sun gears. An element, for example an aircraft lift control surface, may be mounted on one set of the ring gears by means of spindles which extend normally of a plane which includes the axes of the ring gears, so that as a result of stresses therein the element may tilt locally about the spindles.

Abstract: A rotary to linear converter has a rotary input shaft and a linearly movable output element. A torque limiter arrests rotation of the shaft at a critical value of torque thereon. A friction device increase the torque on the shaft if a predetermined axial force on the output element is exceeded, this torque increase being sufficient to operate the limiter. The arrangement renders operation of the torque limiter directly responsive to axial force on the output element.

Abstract: A fluid powered actuator system includes two identical fluid powered actuators operable by respective supply pressures which are controlled by respective identical valve arrangements. Operating positions of flow control elements of the valve arrangements are applied through respective couplings to a differential arrangement which operates, if these positions differ by an unacceptable amount, to apply an error indication through respective coupling to prevent the supply pressures from being applied to the respective actuators.

Abstract: A device is provided for causing the force applied by a rotary transmission to a driven apparatus to have a substantially constant limiting value of the range of operation of the apparatus, and comprises a clutch which is responsive to the transmitted torque and to the operating position of an output member of the device, and a brake which is responsive to relative movement of the clutch parts to arrest at least the output member.