The U.S. National Transportation Safety Board (NTSB) is increasingly certain the rudder control system of a Boeing 737-300 contributed to the crash of USAir Flight 427 last September near Aliquippa, Pa. During hearings held here last week, expert testimony centered on effects of the rudder system on aircraft control and how wake turbulence may have precipitated an aerodynamic upset that led to the crash that killed 132 persons. Flight 427 was approaching Pittsburgh ...


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