RNP = Required Navigation Performance. ILS, VOR, or NDB are not predicated on performance-based navigation.
thats what i said and even went on to explain that suppose my rnp falls below 0.3 does that mean i cant even do an ils approach. how do i land then
told them of the 320 where if my nav accuracy falls below 1 i just switch to raw data and continue. he wasnt convinced at all.
Having said that, I can see the value of expressing an RNP value for VOR or NDB approaches if they are authorized for RNAV overlay flight of the final approach segment; i.e., "VOR or GPS Runway36," for example.
i hope he was talking about this but i doubt it.
RNP Requirements are detailed in FCTM, and for Airbus in Instructor support section on GPS Primary description
will try to refer to them
RNP values for non precision approaches is of course something kinda old
1 nm as per 320 sop.