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and the supporting structure for the vertical fin. The vertical fin separated from the airplane. Hydraulic components located in the aft body were also severed, leading to a rapid depletion of all four hydraulic systems. The loss of the vertical fin, coupled with the loss of all four hydraulic systems, left the airplane extremely difficult, if not impossible, to control in all three axes. Lack of independence of four hydraulic systems from a single failure event was a zonal hazard. The aircraft struck

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