Primary finding
Probable cause
The pilot’s failure to maintain helicopter control while hovering low over a body a water while facing into the sun, which resulted in a loss of visual reference and subsequent impact with the lake surface.
Investigator assessment
Analysis narrative
The pilot reported that, he maneuvered the helicopter to a low and slow hover over a recreational lake. The helicopter was facing into the sun, and the sun’s reflection off the water produced a “significant glare.” The pilot lost his visual orientation with the water and sky, and when he realized that he was too low and saw water on the nose bubble, he attempted to increase collective, to increase altitude but was unable to do so. The pilot turned the helicopter on its side to stop the main rotor blades. The helicopter subsequently collided with the water and sank. The helicopter sustained substantial damage to the main and tail rotor drive systems. The pilot reported that there were no preaccident mechanical failures or malfunctions with the helicopter which would have precluded normal operation.