XNR,
AS355 F1 (MTOW 2400 kg) Cat A level helipad is 2090kg at SL/30 degC. The N model will do it at 2400 kg.
I see what you are getting at now though (appologies for the above sucking eggs stuff). The supplement in our F1 states "Though the helicopter is not certified to FAR 29 for Category A operation this supplement deals with the procedures and performance allowing the aircraft to be operated in a similar way." In other words, the aircraft can be operated to Cat A but it is not actually "certified" as such. I think that was your point XNR wasn't it?