When USAir Flight 427 plunged from the sky on Sept. 8, none of the 127 passengers or five crew members survived to help explain what might have triggered the 6,000-ft. nose dive. Nor have investigators found evidence of wing, rudder or engine failure in the charred rubble of the 737 jet. That leaves little to explain the tragedy except a "bump" -- a sudden airspeed increase detected by the plane's flight-data recorder. Wind has been ruled out, since only a 7-m.p.h. breeze was evident that evening. And earlier reports of the cry "Traffic!" on the cockpit voice recorder have proved false....
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