Two hydraulic (double acting, variable-rate, temperature-compensating, viscous) dampers are mounted on a pair of adapters which are attached on mast splines below the main rotor. The double acting lever is attached by a control tube to the stabilizer bar frame. As the bar is displaced during operation the cam displaces the pin. Movement of the pin and damper timing (5 ± 1 second ) determines stiffness (viscous) of action, therefore, the degree of stability the bar affords the helicopter. Damper rate and timing cannot be adjusted in the field but is factory preset for desired action. A window is provided through which fluid level and damper timing may be checked.
The sum bich becomes unstable
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