Boeing 737 Rudder Issues
Starting in 1991, a number of accidents and incidents involving the Boeing 737 were the result of uncommanded movement of their rudders. The rudder is controlled by the Power Control Unit (PCU). Inside the PCU is a dual servo valve which helps direct hydraulic fluid in order to move the rudder. The PCU is manufactured by Parker Hannifin.
Read more about Boeing 737 Rudder Issues: Accidents, Other Suspected 737 Rudder PCU Malfunction, SilkAir Controversy, Boeing 737 Rudder Upgrade Directive, Cultural References
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