![]() Like an ILS, most LPV approaches will get you down to 200' above touchdown, with 1/2 visibility.īut like most things in aviation, where there's an upside, there's also a downside. That 700' of width at the threshold is the same as an ILS localizer at the threshold, but it doesn't get any tighter than that as you continue to touchdown. Unlike an ILS, which gets more and more sensitive (and difficult to fly near and below DA), the scaling on an LPV approach transitions to linear scaling as you approach the runway, with a total width of 700' (usually) at the runway threshold. There's definitely an advantage with LPV. The localizer antenna provides lateral guidance, and the glideslope antenna provides vertical guidance. And it does so with two ground-based antennas: a localizer antenna, and a glideslope antenna. The ILS is a precision approach because it provides both lateral and vertical guidance. In fact, the first time it was used by airlines dates back to 1938. ILS: The Only True "Precision" Approach For You So what's the difference between these three approaches, and which one should you be flying? Let's take a look at all three. Now with GPS, the number of approaches with vertical guidance has tripled, and to an extent, so has the confusion. 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.īut all of that has changed. Not long ago, you only had one kind of approach with vertical guidance: the ILS.
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