The rudder surface most likely deflected in a direction opposite to that commanded by the pilots as a result of a jam of the main rudder power control unit servo valve secondary slide to the servo valve housing offset from its neutral position and overtravel of the primary slide. InvestigationĪfter the longest investigation in aviation history-more than four and a half years-the concluding statement said: The National Transportation Safety Board determines that the probable cause of the USAir flight 427 accident was a loss of control of the airplane resulting from the movement of the rudder surface to its blowdown limit. At about 6,000 feet (1,800 m) and 6 miles (10 km) from the runway, the aircraft experienced a sudden loss of control and slammed into the ground in a nearly vertical nose down position in Hopewell Township, Beaver County, near Aliquippa, Pennsylvania, killing all 127 passengers and 5 crew members.įlight 427 has the third highest death toll of any aviation accident involving a Boeing 737-300 after the crash of Flash Airlines Flight 604 and China Southern Airlines Flight 3943. 45-year-old Captain Peter Germano and 38-year-old First Officer Charles B.
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