USAIR CRASH INVESTIGATION CONTINUES

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Federal investigators said engine parts from Flight 427 indicate a potential cause of the accident: one or more of the components called "actuators," which help slow the plane's movement, may have been set off without a command from the cockpit. That action could have inappropriately reversed the thrust of the engines, causing the plane to roll off into a dive. The actuators are normally deployed to slow a plane down only after landing. USAir records show a flight crew reported problems with the plane's reverse thrust two and a half months earlier.