OK FPO, regardless of you fallouts the topic needs clarifications. First of all, airbus allows to fly DME ARC with unserviceable NAV AID, which essentially is nothing but a radius to reference point. VOR DME is stored as a reference point in our data base that's why we need to check NAV accuracy in TMA and if not satisfactory revert to raw data. No such option is available for RNP and that's the only difference. As stated before contingency is what's relevant for this type of approach. From technical and geometrical point of view however there's no difference at all. The question is however related to SID. I recommend you to read 17th airbus safety conference brochure S RNP-AR publication in which there's a table classifying what's AR and what's not. DEP and/or missed approach RNP < 1 NM is AR. 1 NM is NOT AR. You gotta give the befit of the doubt and maybe some credit to others.
