N13GZ

Probable cause: Guardian Flight s inadequate pilot training and performance tracking, which failed to identify and correct the pilot s consistent lack of skill, and which resulted in the pilot s inability to maintain his position inflight using secondary instruments to navigate when the airplane s electronic attitude direction indicator failed, leading to his spatial disorientation and subsequent loss of control. Contributing to the accident was the lack of a visible horizon during dark night overwater conditions and the pilot s failure to declare an emergency with air traffic control.