![]() No one has ever made it safely to the ground. The incident is one of the most widely recognised crashes in the world.ĭubbed the ‘un-flyable plane’, the scenario has been recreated in flight simulators across the globe. That production process gave way to a more refined method in the mid-1970s, according to FAA officials.On JUnited Airlines Flight 232 crash-landed at Sioux City Airport (SUX), Iowa. The Federal Aviation Administration has ordered airlines to test for cracking on disks manufactured in the same manner as the one on the United plane. ![]() The flaw occurred in manufacturing the 19-year-old component, officials say, but they have yet to determine when cracking began and whether it should have been detected before the accident. Metallurgists conducting tests on the recovered remains of the disk have found cracking in a weak spot that has been compared to a knot in a piece of wood. Officials believe that defects in the component caused it to break apart as the plane was flying at 37,000 feet. The investigation into the Sioux City tragedy is centering on a 300-pound part from the tail engine called a fan disk. Even though an engine ripped away from a wing, investigators concluded that plane could have been saved with proper action in the cockpit. The findings of the simulator tests are in marked contrast to those from simulator testing that followed the 1979 crash of an American Airlines DC-10 near O`Hare International Airport.
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