The U.S. Navy determined that the crash of a Broad Area Maritime Surveillance-Demonstrator (BAMS-D) was due to a faulty ruddervator.
However, the pilot at the controls also violated emergency procedures by not commanding the aircraft to climb to above 40,000 feet.
[thumb]http://www.defensenews.com/article/20130107/C4ISR02/301070006/How-Large-U-S-Navy-UAV-Crashed-Maryland-From-18-000-Feet?odyssey=tab|topnews|text|FRONTPAGE[/thumb]