A ballscrew actuator for tilt-rotor and pitch trim applications is described that provides structural and operational redundancy in respect of any single failure mode. It is powered by two hydraulic motors, operated separately. Configuration layout, dual-path constructions, and component details are illustrated. Comparison is made with earlier designs and reasons are given for their varying ratios of flight load/actuator weight. It is evident that cross-coupling of two pylon actuators involves gains in weight and cost.
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