Originally Posted by
Aperture
Thanks for the answer.
So technically, let's imagine the weather is NO DH, you don't see anything, LVP are in place at the airport, and our a320 is showing CAT II on the FMA; it can land automatically then. But legally, it's not allowed due to the fact that it would be fail passive, so no redundancy, so the law says don't do it because of that ?
you are essentially correct.
for Low Vis Ops you need 3 things. Qualified crew, approved airport - LVPs in force & serviceable aircraft.
Btw fail-operational AP is one requirement for CAT3B. Auto thrust is another.