I'd call this VERTICAL GUIDANCE OF FMS/FD FOR FINAL APPROACH SEGMENT but it is such a mouthful. If the on-board system is capable of generating a vertical profile, a mathematical glide path for the final approach, the Flight Director may be set up to follow that guidance and provide steering commands for AP / human at controls. But they are fundamentally different, just like ILS and LOC approaches that also commonly share one page.ī) The VNAV mode of autoflight vertical guidance. Note 1: The a) above is somewhat obscured by the fact that the printed chart is normally combined for "3D APCH (LNAV+VNAV) and "2D APCH(LNAV only)", the only visible difference being the two boxes of different minima. Maybe it is possible to call this "3D APCH (LNAV+VNAV)" for the purpose of this conversation. Procedures for RNP LNAV+VNAV which is a 3D approach type (=with vertical guidance) require specific design, need to be published as such and operator must be authorized by their CAA to fly them, with all the bells and whistles normally associated such as training for the specifics of the operation. Different from the others in its own manner, similar as with CAT II being different from a simple CAT I approach. A stand-alone type of instrument approach procedure. Most likely I'd be preaching to the converted, reader's patience is appreciated.Ī) The LNAV+ VNAV sub-version of RNP APCH. Let me try to split them so we can be certain of reading the same page. Toseq: there seems to be still a little confusion over the terminology because VNAV is used for two independent things.
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