Originally Posted by Unkki
Is a dual FMC required for RNP APCH on the B737NG? We have some airplanes with 1x FMC.
Our national regs (not aircraft specific) require one of everything for an RNP APCH LNAV. They require two of everything for an RNP APCH AR.
Originally Posted by unkki
The PBN navigation specification RNP APCH is the official term for instrument approach procedures including the final approach segment. These procedures are often (and incorrectly) referred to as RNAV approaches, due to the (old) naming convention on Instrument Approach Charts (IAC), i.e. RNAV (GNSS) or RNAV (GPS) approaches. These procedures are gradually replaced by the new procedure name RNP RWY XX.
That is not correct here. The (new) RNP approaches are named on the AIP charts as follows: an RNP APCH AR is called an "RNAV-X (RNP) Rwy XX"; and an RNP APCH LNAV is named "RNAV-Z (GNSS) Rwy XX. The "X" and the "Z" varies, depending on how many RNAV (RNP) approaches are published to that runway.
You obviously cannot have a simple title "RNP RWY XX" because that would not designate what type of RNP approach it is, given there are LNAV, LNAV/VNAV, LP, LPV and AR types of RNP approaches.