A compact positioning mechanism for an indicator assembly of the type comprising first and second bar members arranged in a V-like configuration and collectively defining a command plane which is both rotatable about and transversely displaceable with respect to a reference axis. A pair of ring members, each formed with a camming surface, carry the respective bar members on a cam follower pivotably mounted on one ring and in camming engagement with the cam surface on the other. Rotation of the command plane is achieved through like rotation of the two rings while displacement transverse of the reference axis is achieved by relative rotation between the two rings.
The improvement includes a unique indicator and associated circuitry for glide slope and localizer data. The device has a closed loop circuit with an optical position transducer therein. The circuit loop operates in conjunction with the received raw data from the glide slope and localizer transmitters to accurately locate a pointer (or indicator) controlled by a unique rotary solenoid actuator.
A gyro is gimbaled within a frame which is fixed within an aircraft. Roll indicia is responsive to the gyro for rotation within a display window on the frame about an axis parallel to the roll axis of the aircraft. A horizon indicating member is also responsive to the gyro for movement within the display window to remain parallel to the actual horizon during flight of the aircraft. A steering bar is movable within the display window relative to the roll indicia and the horizon indicating member in dependence upon selected flight guidance commands.
