Probers Doubt Thrust Reversers Caused Jet Crash
Evidence recovered from the wreck of USAir Flight 427 cast doubt Tuesday on the theory that the jet crashed because its right engine was thrown into reverse.
Federal investigators determined the devices that engage an engine’s thrust reversers were not deployed on the right side of the Boeing 737-300, suggesting the engine was operating normally.
The devices, called locking actuators, determine the position of other actuators that control the thrust reversers, a braking mechanism. The other actuators, found in the deployed position, now are believed to have shifted on impact.
Three possible scenarios leading to the crash will be tried out via computer: that the right engine reversed, it came loose, or spoilers--wing flaps that act as air brakes--were unevenly deployed.
Haueter said the right engine’s rear mount also was recovered and appeared to have been dislodged by the impact.
A National Transportation Safety Board spokesman said investigators haven’t ruled out any possible cause yet for Thursday’s crash, which killed all 132 aboard.
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