What happened
During a night flight under visual meteorological conditions, an instrument-rated commercial pilot departed from an airfield located near the Gulf of Mexico. The flight was conducted under instrument flight rules with a planned cross-country route. While traveling in a south-southwesterly direction, the aircraft reached an altitude of approximately 900 feet above the water.
At this altitude, the aircraft entered a sharp right-hand turn. Following this maneuver, the plane began a rapid descent, eventually striking the surface of the ocean in a nose-low orientation. There were no survivors of the impact.
Findings
An investigation of the wreckage, including the engines, propellers, and flight control systems, showed no signs of mechanical failure or malfunction prior to the crash. Although investigators discovered that the fuel line from the left auxiliary fuel pump had separated due to an improperly secured B-nut, engine monitor data confirmed that neither engine experienced a loss of power during the flight. This suggests the fuel line separation happened during the impact itself.
Investigators concluded that the primary factor was spatial disorientation. Despite the pilot's recent instrument training, the combination of darkness and the lack of visual landmarks over the open water created a high risk for disorientation. The aircraft's trajectory, characterized by an excessive bank angle and a steep rate of descent following a turn, is consistent with the pilot losing situational awareness of the aircraft's attitude.