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UA328: Initial NTSB findings show metal fatigue
Initial inspections of the Pratt & Whitney PW4000-112 engine that caught fire on flight UA328 on Saturday have found that Turbine Blade No11 sheared off at the root “likely caused by metal fatigue”. Turbine Blade 10 was also sheared mid-way along its length, probably after being hit by Blade 11. [read more]