RNAV Approaches
Guys,
Take care out there.
I believe the Primus 1000 and UNS 1 systems could only be certified for BRNAV.
With BRNAV certification you are only permitted to use it down to MSA in terminal airspace. If you have full PRNAV you can go to the final approach fix and to go beyoind the final approach fix you need full GNSS approval.
Your AFMs will state your level of approval.
Overlay and back up is a good idea but take care to ensure the raw data is also still there.
MM