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PRIMARY FLIGHT CONTROL SYSTEMS
Horizontal Stabilizer Control System (Single Axis)

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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assembly consists of a bobweight, a viscous damper, and a push-pull tube. The push-pull tube is the interconnect between the control stick and the bobweight. The damper is located at the pivot point of the bobweight and restricts fast movement of the bobweight. The aft bobweight and damper assembly works with the forward assembly to overcome the heavy pull of gravity and retard the chance of overcontrol. See figure 9-4. This assembly is installed in the fuselage, forward and below the horizontal stabilizer. It connects to the elevator control cables. The aft assembly consists of a bobweight, a viscous damper, and a load spring. The bobweight connects to the elevator control bell crank and the damper. The load spring is between the elevator control bell crank and the fin structure to balance the forward and aft bobweights when the elevator is in a neutral position. The elevator power mechanism changes the mechanical movement of the control stick to the hydraulic operation of the elevator. See figure 9-5. The mechanism is in the aft section of the aircraft directly below the horizontal stabilizer. As in the aileron power system, the mechanism consists of a hydraulic power cylinder, control valves, linkage, and hydraulic piping. When the elevator controls are operated, the control valves port hydraulic pressure to the power cylinder. The hydraulic pressure extends or retracts the cylinder piston to move the push-pull tubes. The push-pull tubes deflect the elevators. The control valves are two separate valves connected in tandem by linkage. One valve is supplied hydraulic pressure by the utility hydraulic system. The other valve is supplied hydraulic pressure by the flight control hydraulic system. The power cylinder has dual hydraulic chambers to work from each control valve. Each hydraulic system simultaneously supplies Figure 9-4.—Elevator aft bobweight and damper assembly. 9-4







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