In addition to its relative light weight and simplicity, the typical system is robust, requiring little in the way of maintenance except lubrication, careful inspection and occasional checks to verify cable tension.
Basically, when a pilot pulls back on the pitch control, deflects the ailerons or steps on a rudder pedal, he or she is moving the control surface by activating its linkage. Systems used for yaw and roll control are similar. For reference, the graphic at right depicts a simplified version of a generic pitch control system. The typical personal airplane uses a system of cables and pulleys, often connected to pushrods, to transmit pilot input from the cockpit to the primary control surfaces. To understand them, though, we first have to understand the systems themselves. Many lessons were learned from this accident, including alternatives to aircraft control when the primary systems have failed. Survivors totaled 185, including the flight crew. Bud Day Field in Sioux City, Iowa, where the DC-10 crash-landed, killing 111 of the passengers and crew aboard. Using the only controls remaining-the left and right engines’ throttles-the crew managed to descend and approach the Sioux Gateway Airport/Col.
Those lines quickly leaked out their fluid, eliminating any ability for the flight crew to reposition the airplane’s primary control surfaces. The pieces penetrated the engine’s containment shroud and severed the airplane’s hydraulic lines. On July 19, 1989, while in cruise at F元70, the jet’s center, tail-mounted engine’s fan disk failed. Perhaps the classic example of a failed flight control system involves United Airlines Flight 232, a scheduled domestic passenger operation of a DC-10.
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