I think they are being cagey
I have tried without success to find the civil cert records for the MRB, I do find it strange that the Carson site doesnt quote which FARs the blade has been certified against.
I have heard a rumour (appropriate for this site) that the blade has not been cleared by the FAA for passenger carrying aircraft i.e its use is limited to cargo/logging operations which begs the question how can we carry troops using them?
DM