11/19/2022 0 Comments Ils vs localizer![]() ![]() Their goal is to support LP approaches “sometime soon,” so stay tuned. #Ils vs localizer updateIt’s a completely new type of approach, and Jeppesen is still working to integrate these into your normal update cycle. That’s because the Jeppesen NavData database does not support LP approaches. #Ils vs localizer softwareGTN and G1000 panels do not require a software upgrade.īut even with the right hardware, you still can’t fly an LP approach right now. #Ils vs localizer seriesFor Garmin 400/500W series navigators, you’ll need software version 3.3 or higher to enable LP approaches. You’ll need to plan your descent and make sure you hit MDA with plenty of time to look for the runway environment.įinally, and most importantly, can your GPS even fly an LP approach? This is a type of WAAS approach, so for starters you’ll need a WAAS-approved GPS (like a Garmin GNS 430W or GTN 750). This ends up being a serious drawback for only 60 ft in lower minima (on average) than a basic LNAV approach. Unfortunately, as of today, your GPS will not provide an advisory glideslope on an LP approach. It’s a huge aid for situational awareness. It’s not a true glideslope, just a way to make your descent from FAF to MAP smoother. Secondly, what about an advisory glideslope, one of the major advances in WAAS GPSs? Remember that if you fly an LNAV approach using a WAAS GPS, you’ll get a handy vertical needle to track. If you are flying an LP approach and the lateral integrity limit is exceeded, you’ll need to fly the missed approach. Likewise, an LP approach cannot downgrade to an LNAV approach. ![]() This is not like an ILS that can be downgraded to a localizer approach on the fly. No problem, right? Maybe not, except for three important questions.įirst, you’ll notice that an LPV approach chart will not show LP minima, just LNAV/VNAV and LNAV in most cases. Intercept the final approach course outside the final approach fix, watch for your GPS to annunciate LP, hit your crossing altitudes on the descent and stop at MDA while you look for the runway. The FAA is basically saying, “you’re not going to get an LPV approach, so this is as good as we can do.”įlying the actual approach is easy, and exactly like a localizer approach. ![]() So why doesn’t the FAA just put in an LPV approach? Usually it’s due to obstacles, terrain or infrastructure limitations at the airport. It’s not much of an upgrade, and there is a downside, as we’ll soon see. In practice, though, many LP approaches have minima that are only slightly lower than the existing LNAV approach. This means an LP approach will often result in lower minima than a plain vanilla LNAV approach–ideally with an MDA around 300 ft. Think of it as the 21st century version of a localizer approach.īecause of the angular nature of the LP approach guidance, the protected area is significantly smaller than for an LNAV approach. But unlike an ILS or LPV approach, there is no glideslope on an LP approach. By contrast, on a traditional LNAV approach, CDI sensitivity is the same from the final approach fix to the MAP (think rectangle). You probably learned that LPV means “localizer performance with vertical guidance.” Logically, then, LP simply means “localizer performance.” The important point is the lateral guidance is angular, with needle sensitivity increasing as you get closer to the missed approach point (think triangle). So what is an LP approach? Actually, it’s just what it sounds like. Compared to the 2800+ LPV approaches, this is a small number, but there enough of them out there that you’ll encounter one sooner or later. As of May 2012, there are over 280 active LP approaches. LP approaches were actually introduced by the FAA in 2009, but they are just now appearing in large numbers. LPV approach deal–the first is an old school “dive and drive” non-precision approach the second is basically an ILS that uses GPS instead of ground-based navigation aids.īut what’s this new LP approach that’s showing up on some approach plates? Have the rules changed? After some practice, you’ve just about figured out this whole LNAV vs. You’re a current instrument pilot and you even have one of those fancy WAAS GPSs in your panel. ![]()
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