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FEATURE
tified baro-VNAV systems could use the a “predictable” rate of descent on the arti-
associated minimums of an LNAV/VNAV ficial glide path. Neat stuff but it is im-
approach. Now, thankfully to WAAS; portant to remember that LNAV+V won’t
these approaches can also be flown using get you any lower than LNAV minimums.
WAAS-enabled receivers. So this is an
approach that you can “train for” and prac-
LPV
tice in your faster than light training heli- This stands for “Localizer Performance
copter. with Vertical guidance.” The LPV is
LNAV+V- Guess what? There are NO strictly a WAAS approach -meaning if
LNAV+V minimums! So, you will USE you don’t have a WAAS-enabled receiver the beginning. This technology will allow
the LNAV MINIMUMS LINE! in your aircraft don’t expect to see LPV nearly every runway end or heliport to be
You WILL see LNAV+V on your annunciation on a “traditional” GPS a candidate for an LPV approach. At last
moving map display of some Garmin screen. LPV approaches almost always report the FAA projection plan calls for
products. Certain WAAS-enabled Garmin give you the lowest possible minimums an additional 500 GPS-based approaches
GPS receivers will, at times, provide you you can get using WAAS. during the year 2009 with most of them
with an artificially created “advisory glide This WAAS approach provides verti- being LPV approaches.
path” from the Final Approach Fix (FAF) cal guidance to as low as 200 feet AGL
to the touchdown area. Again, you will and is, as you guessed it – flown to a DA
What’s New
not see this on approach charts! It is sim- rather than an MDA. The LPV approach LP- This stands for “Localizer Perfor-
ply a way for GPS equipment manufac- essentially uses the same criteria as an ILS mance” and is starting to show up on In-
tures to assist us with a “stabilized system with the main difference being that strument Approach Charts more and more
approach.” My fixed-wing brethren tell ILS systems use ground based transmit- throughout 2009. This WAAS only type
me the advent of this technology can elim- ters whereas LPV’s are based upon the of approach, like a localizer approach,
inate the “dive and drive” descent to the WAAS system positioning signal, i.e. provides accurate lateral guidance but NO
MDA and can therefore provide us with “Enhanced GPS” that we talked about in vertical guidance. The approach uses
26 ROTORCRAFT PROFESSIONAL • Heli-Expo 2010 Preview Issue
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