Really enjoying the 747-8! Going through the manuals and tutorials, flying an ILS approach makes perfect sense, however RNAV GPS approaches are giving me some issues, and this doesn't seem to be explained at all in the manuals. I leave the autopilot in LNAV and VNAV modes all throughout the descent, and Im dialing in the MDA in the ALT Selector. however after passing the final altitude restriction at the FAF, the plane is not intercepting the 3.0 degree glidepath, as is indicated in the FMS. Ive tried leaving it in LNAV/VNAV modes, and it just levels off at FAF altitude with no guidance down. I also tried arming APP mode (which I know is for ILS but wanted to give that a shot as well) and that wont arm. Furthermore if I push in the altitude selector with the MDA loaded up, the plane just nose dives in VNAV speed mode.
Basically is this plane, and the latest version (2.1.1) capable of flying RNAV approaches beyond just the FAF?