WASHINGTON (Reuters) - The engine blade crack that prompted the U.S. military to ground all 51 F-35 fighter jets was over half an inch long, according to three sources familiar with the matter, but it remained unclear if the crack was caused by a manufacturing anomaly or some larger design issue.
Engineers at Pratt & Whitney, a unit of United Technologies Corp, will conduct a detailed examination of the turbine blade as soon as it arrives at the company's Middletown, Connecticut, site, said spokesman Matthew Bates.
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