.How about A/P failure or F/D failure before or after the FAF?
The 737 allows AP off with FD ON or AP ON with FD OFF.
Does you airline allow such configuration before the FAF? or only to continue after having passed the FAF?
.Prior to a GNSS approach,a loss of GPS receivers(GPS light in 737) before the FAF,for example 20 NM..while the ANP remains in the RNP,does your airline allow you continue beyond the FAF?
RNP (AR) operation is only allowed in LNAV/VNAV in my outfit, therefore yes, you need either the autopilot or the flight director. All other approaches can be flown using IAN and therefore neither AP nor FD is needed. After the FAF one can continue after a failure only, if sufficient visual reference is established and can be maintained.
And yes, if the ANP remains below the RNP we can continue, even for a dual GPS loss on a GNSS approach.