A fatal U.S. Osprey aircraft crash last year in southwestern Japan that killed all eight personnel aboard during a routine exercise was caused by a gearbox failure and faulty decision-making in response to the malfunction, the Air Force said Thursday.The U.S. Air Force Special Operations Command released the results of a months-long investigation into the CV-22 transport plane crash off Yakushima Island on Nov. 29, the deadliest accident involving a tilt-rotor aircraft since they entered service in 2007.The command concluded that the accident was due to "a catastrophic failure of the left-h…READ FULL ARTICLE