A final accident investigation report on the crash of an RQ-4A Global Hawk unmanned aerial vehicle during Operation Enduring Freedom concluded that a nut and bolt that had mistakenly been installed backwards ultimately led to the destruction of the aircraft. In a July 3 statement, Air Combat Command said that that the accident investigation board found that a "structural failure of the Global Hawk's right V-tail and ruddervator assembly due to massive delamination of the main spar" was ...

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