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Vnav lnav12/9/2023 ![]() Instead, they're just like an LNAV only approach, decreasing to 0.3 NM sensitivity when you're within 2 miles of the final approach fix, all the way to the missed approach point. It is LNAV/VNAV utilizes approved vertical guidance possible to have LP and LNAV minima published offered by WAAS and approach certified baro- on the same approach chart. Unlike LPV approaches, LNAV/VNAV approaches don't have increasing angular guidance as you approach the runway. They were originally designed for baro-aided GPS units, but most WAAS receivers can use them today as well. LNAV/VNAV approaches were actually the first type of GPS approach that had vertical guidance. The second type of GPS based APV approach is LNAV/VNAV. (There are a few more details as well, which you can find in AIM 1-2-3, paragraph D.) LNAV/VNAV: Lateral Navigation/Vertical Navigation Since LPV approaches aren't considered precision approaches, you can't use precision alternate minimums for airports that only have LPV.Īccording to the FAA, if you're using an airport with LPV only (no ILS or other ground-based navaid approach) as your alternate airport, you need weather minimums that meet the LNAV or circling MDA, or the LNAV/VNAV DA if you're equipped to fly it. A baro-aided GPS won't work.īut there is a downside. Keep in mind though, to fly them, you need a WAAS receiver. And, just like an ILS, an LPV approach's angular guidance scales down the closer you get to the runway. So how do they work? The extremely accurate WAAS system (7.6 meters or better accuracy) gives you lateral and vertical guidance down to a decision altitude (DA) like an ILS. The precision approach definition also carries a lot of documentation, definition, and cost with it, so the FAA and ICAO adopted the APV definition, so they could build new approaches and not be burdened with the cost and paperwork. Area navigation (RNAV) approach plates include LNAV as a. So what's the difference? APV approaches don't meet the ICAO and FAA precision approach definitions, which apply mostly to localizer and glideslope transmitters. In aviation, lateral navigation is azimuth navigation, without vertical navigation (VNAV). Instead, they're an approach with vertical guidance (APV). Even though LPV approaches have vertical guidance, they're not considered precision approaches. LPV approaches are a WAAS/GPS based approach, and they're very similar to the ILS. LPV: Localizer Performance With Vertical Guidance So what's the difference between LPV and LNAV/VNAV approaches? They're both GPS based approaches with vertical guidance, but the similarities end there. With GPS, the number of approaches with vertical guidance has tripled. Over the past several years, the FAA has created GPS based LPV and LNAV/VNAV approaches at thousands of airports across the US. And if you weren't flying an ILS, you were managing step-down altitudes on a non-precision approach. It wasn't that long ago when you only had one kind of approach with vertical guidance: the ILS.
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