The DC-10 accident was caused by a crack in a turbine fan wheel assembly that exploded in the #2 engine that is in the tail tunnel. The fan turbine actually screwed itself out the tunnel and cut through the hydraulic lines that were routed in the top of the fuselage. After the Sioux City accident, McDonnell Aircraft Co modified the hydraulic system with a "Sioux City Valve" (check valve) to cutoff leakage in the tail section. Basically the intent was to save hydraulic quantity and pressure to the forward flight controls to aid control of the aircraft. We practiced running and executing the checklist created for dealing with the Sioux City scenario in the simulator every year using only the throttles and differential thrust to landing. Trust me it was not easy to land safely and required perfect crew coordination and some luck.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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