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Mechanical Positional Indication

Early flying control systems used to use a mechanical feedback system to allow the flight crew to see where the flying controls were positioned. other examples include flap and undercarriage systems. In both these system a selection by the crew resulted (through control cable movement) in a selector valve being moved. This would port hydraulic fluid to jacks or actuators and cause the system to move. As the (flap) moved this would move >an extra set of control cables< that went back to the flight deck to back off the signal (negative feed-back) and provide the crew with visual indication of position. Used on older aircraft.