The court of inquiry ruled that the crash was due to pilot error.
【due to】调查庭裁定飞机失事是由驾驶员的失误造成的。
英语百科
Naval Board of Inquiry
Naval Board of Inquiry and Naval Court of Inquiry are two types of investigative court proceedings, conducted by the United States Navy in response to an event that adversely affects the performance, or reputation, of the fleet or one of its ships or stations.