Thanks for the link to AC29-2C.
Of course, the section AC 29.1309(b)(3)(i)(E) regarding catastrophic failure of flight critical systems is similar:"(E) Catastrophic Failure Conditions must be Extremely Improbable."
It's also worth noting that the full FAA AC29-2C document from 2014 is 1258 pages. This is probably many times the number of pages in the FAR 29 regulations at the time the EC225 was FAA certified.