| Usair Flight 427 |
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US Airways Flight 427 was a commercial airline flight from Chicago 's O'Hare International Airport to Pittsburgh, Pennsylvania , with a final destination of West Palm Beach, Florida . The flight crashed on September 8 , 1994 , killing everyone on board. On that day, the Boeing 737-3B7 , registered N513AU, was approaching runway 28R in Pittsburgh's airport, which is located in Findlay Township, Pennsylvania . At about 6,000 feet (1,830 meters) 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 position in Aliquippa, Pennsylvania , killing all 127 passengers and 5 crew members. After its longest investigation in 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. 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. {Link without Title} The NTSB concluded that similar rudder problems caused the previously mysterious March 3 1991 crash of United Flight 585 , and the June 9 1996 incident involving Eastwind Airlines flight 517, both of which were Boeing 737s. Other changes resulting from the investigation were:
427 is no longer a valid flight number for any flight on US Airways' timetable. EXTERNAL LINKS
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