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fatal Osprey crashABC News
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83% Informative
The November crash of a V-22 Osprey killed eight Air Force Special Operations Command service members.
It was the second time in less than two years that a catastrophic failure of a part of a proprotor gearbox caused a fatal accident.
The Air Force identified cracking in a pinion gear as one of two factors that caused the crash off Japan .
The gearbox is a sealed system, meaning ground crews on base can't open it to inspect the gears for inclusions.
Even if they could, they don't have the machining needed to detect the microscopic defects.
It's not clear whether other Osprey parts, including the input quill assembly, are also made from the X-53 alloy.
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