No confusion at the helicopter division of Finmeccannica - Cat A and Cat B are certification standards and the RFM is written as part of the certification requirements.
The PC1, PC2 and PC3 operating standards are mandated only in those areas that accept this ICAO definition. EASA being one of them. Elsewhere you will find an assortment of FAA and hybrid approaches to operating standards or none at all. A
As things stand at the moment there is the prospect of the two (Certification standards and operating standards) being found in the same official manufacturer's Flight Crew Operating Manual. Coming your way..... one day...
Watch this space.
G.
