Boeing 737 Rudder Issues
Boeing 737, Rudder, Hydraulic fluid, Parker Hannifin, United Airlines Flight 585, Copa Airlines Flight 201
978-613-6-65562-8
6136655624
140
2011-06-08
45.00 €
eng
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Starting in 1991, a number of accidents and incidents involving the Boeing 737 were the result of the airplanes' unexpected movement of its rudder. 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. On March 3, 1991, United Airlines Flight 585, a 737-200, crashed in Colorado Springs, CO, killing 25 people. On June 6, 1992, Copa Airlines Flight 201, a 737-204, flipped and crashed into a jungle in Panama, killing 47 people. On September 8, 1994, USAir Flight 427, a 737-300, crashed near Pittsburgh, PA, killing 132 people. During the course of the investigation of Flight 427, the NTSB discovered that the PCU's dual servo valve could jam as well as deflect the rudder in the opposite direction of the pilots' input, due to thermal shock, caused when cold PCUs are injected with hot hydraulic fluid. As a result of this find, the FAA ordered that the servo valves be replaced and that new training protocol for pilots to handle unexpected movement of flight controls be developed.
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