The flight was to be a simple aerial photography mission over a large expansion construction project at Baltimore-Washington International Airport (BWI). The Bell 206B maneuvered over the work area at about 400 ft. AGL. However, soon after slowing to a hover, the helicopter did a rapid 180-deg. right turn around the mast, stopped momentarily, then continued its clockwise spin. According to one witness, the helicopter continued in a descending turn until striking the ground violently, ...

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