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FormerMember07122019_2
Guest
Quite true but, we shouldn't expect them to know if they don't fly traditional aircraft, I mean, how could they? The answer is education and this Forum is certainly one of the best places for that. Those who do have pilot licenses can be a great help to those who don't by explaining such things as "localizer minimums" and "final approach fixes."
It is if your OpSpecs require you to remain within one "dot" of the glideslope when cleared for an ILS approach. Clearance for the Localizer however does permit you to descend to the missed approach altitude once inside the Final Approach Fix.
For those who aren't sure what we're talking about, here's an ILS approach plate (ILS approaches are "precision" approaches while Localizer approaches are "non-precision," but both are depicted on the ILS approach plate. As you can see, the height above the ground (or touchdown) for the LOC (GS out) approach is 439' AGL which, as Mavicdrvr stated, can be well below the glideslope. ILS receivers are not cheap so most light aircraft do not have them and consequently, those pilots can only fly the Localizer approach with higher minimums.
But the crux of the situation is, no one should be flying a UAS anywhere along the runway centerline from the Final Approach Fix inbound.
View attachment 72747
Instrument rated pilots are the ideal situation; almost all know the rules and follow them. A bigger problem is VFR pilots trying to sneak back to the airport in deteriorating conditions, flying under the low clouds (scud running) and consistently under the recommended glide slope. I can proudly say I never did this but I have seen others.