Dear oh dear.
Well this is what the preliminary report says
The rotor hub remained attached to the rotor mast; however, both spindle assemblies and their respective main rotor blades had separated from the hub and were not recovered
and, they are showing pictures of the bolt hardware.
Do we assume because of that the bolts intoto are missing? what is remaining? Any evidence of bolt breakage and twisting off of the hub? I don't have any idea how malleable the hub is and whether it could bend to accommodate such movement.
My gut feeling is that it would be extraordinary for the spindle hub-end to break before the retaining bolt, but I'll happily bow to wiser metallurgical heads.
A seaside residence and unchecked corrosion on steel bolts may have an answer, but gee whiz, surely not that bad and on both bolts????????.