Abstract: A throttle servo for each engine of a multiengine aircraft and servo tracking means for detecting and compensating for servo drift during autothrottle mode of operation.

Abstract: A gyro system employing the pickoff synchros as erection sensors and as torquers to erect the gyro.

Abstract: In a helicopter a servo system connected to operate in parallel with the rotor blade pitch controlling linkages and also to receive autopilot generated signals directing maneuvers. The system limits the autopilot control over the blade pitch or position in the short term and permits full control over the long term.

Abstract: Method and apparatus for limiting the authority of a position servo system over an aircraft control surface. The amplitude of the energizing signal delivered to the actuator portion of the servo system is limited in accordance with a non-constant function of time.

Abstract: A drive mechanism for positioning a moveable indicator in rotation about, and/or radial displacement with respect to, a fixed reference index. Dual dial cord drives are employed which are driven from respective inputs definitive of the rotation and radial displacement to be individually or compositely imparted to the moveable indicator. The pair of dial cords are attached circumferentially to diametrically opposed portions of a cylinder with the moveable indicator extending on a diameter common to those portions. The cylinder portions are confined between, and maintained in sliding tangential engagement with, respective ones of a pair of space-separated, fixed-mounted channel guides. Implementations of the cylinder portions are exampled as diametrically opposed segments of a cylinder, diametrically opposed points on a ring, and diametrically opposed circumferential extremes of a cylindrical plate.