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A crack in an engine part that may have caused the July crash of a United Airlines jet in Sioux City, Iowa, killing 112 passengers, was made from a batch of titanium that had "minor cracking flaws," documents showed. The National Transportation Safety Board Wednesday released documents that showed a manufacturer, TIMET Co. of Henderson, Nev., had problems with a log of titanium from which the cracked fan blade disk on Flight 232 was made. Eight disks, including the suspected United part, were made from the same 6,000-pound log of titanium. The titanium was delivered to ALCOA, which forged the disk for General Electric.