The investigators publish preliminary results on the failure of the United Airlines aircraft engine. We know this

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According to the investigators, the Pratt & Whitney engine is failed minutes on United Airlines Flight 328, which flew from Colorado to Hawaii and left a mile of debris. Following the incident, United grounded all Boeing 777s with PW4000 series engines.
A preliminary investigation found the damage “in line with metal fatigue” National Road Safety Committee (NTSB), which has led federal regulators to re-examine the engine inspections.
“Pratt & Whitney is actively coordinating with operators and regulatory agencies to support the revised inspection interval for the Pratt & Whitney PW4000 engines that power Boeing 777 aircraft,” the company said. “Any further updates to the investigation relating to this event are at the discretion of …