RNAV Approaches
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RNAV Approaches
Hi,
Can any one advise:
a.Why certain runways are given with both LNAV & VNAV/LNAV Minimas. In what conditions one will not use VNAV/LNAV minima for that particular runway and will use L/NAV minima?
b.Why certain runways are provided with only L/Nav minima?
Can any one advise:
a.Why certain runways are given with both LNAV & VNAV/LNAV Minimas. In what conditions one will not use VNAV/LNAV minima for that particular runway and will use L/NAV minima?
b.Why certain runways are provided with only L/Nav minima?
Older GPS (without WAAS in the US) aren't accurate enough for VNAV. You can't have VNAV unless you can clear the approach glide path. LNAV alone is just another non-precision approach.
Join Date: Dec 2016
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LPV
Not exactly the case
WAAS is required for LPV approaches and the glide-path generated is electronic and narrows as per an ILS.
LNAV and LNAV/VNAV both use barometric information but in order to use LNAV/VNAV you need to have the ability to generate and follow a FD profile i.e. VS or VGP.
With LNAV and LNAV/VNAV approaches the glide-path does not narrow hence the reduced accuracy and higher minima
WAAS is required for LPV approaches and the glide-path generated is electronic and narrows as per an ILS.
LNAV and LNAV/VNAV both use barometric information but in order to use LNAV/VNAV you need to have the ability to generate and follow a FD profile i.e. VS or VGP.
With LNAV and LNAV/VNAV approaches the glide-path does not narrow hence the reduced accuracy and higher minima
