Andrey Serbinenko wrote:

ignored for a moment, can't you autoland off a normal CAT I ILS if you
so desire? It's the same LOC/GS as the CAT III beam, right? They


If I remember correctly, the glide slope reception and usability for
vertical guidance are only guaranteed above DA for the approach. So,
I'd assume CAT I and CAT II beams don't officially reach the surface
of the runway.

Andrey

The G/S is not used for Autoland below 100 feet, or so. It is all radar
altimetry and computer logic starting at 150 feet, when the system goes
from autoland tracking to autoland align.