Horizontal Stabilizer Control System (Single Axis)

Elevator aft bobweight and damper assembly

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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3,000-psi hydraulic pressure to the power mechanism. If one hydraulic systems fails, the other system supplies enough pressure to operate the mechanism. If both hydraulic systems fail, the cylinder disconnects by pulling the MAN FLT CONT (manual flight control) handle in the cockpit. The controls work manually through the linkage of the mechanism to operate the elevators. The load-feel bungee, shown in figure 9-5, provides an artificial feel to the control stick. The bungee acts as a centering device for the elevator system. Control stick movement compresses the spring in the bungee. Releasing the control stick causes the compressed spring to return the stick to neutral. The bungee also adds a gearing effect between the horizontal stabilizer and the elevators. nose up condition, the bungee action adds nose up elevator. With the stabilizer trimmed nose down, the bungee action adds nose down attitude on the elevator. Horizontal Stabilizer Control System (Single Axis) Various aircraft manufacturers identify the horizontal stabilizer control system by different names. On one aircraft, it is called a unit horizontal tail (UHT) control system. On another aircraft, it is called the stabilizer control system. Regardless of the variation in nomenclature, these systems function to control the aircraft pitch about its lateral When the stabilizer is trimmed to give an aircraft axis. Figure 9-5.—Elevator power mechanism. 9-5

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