Originally Posted by
ClutchCargo
For WN and B6:
I'm curious what your mins are for a handflown CAT3b?
At FX we have RVR 600 with a 100RA Alert Height for the Airbus and RVR 300 (some airports) with a 100RA Alert Height for the MD-11.
With the HUD do you have to see to land?
Yes, they have to see to land. That's why they have a 50' DH. DH means see to land.
Alert height is just a checkpoint for fail operational systems. Failure prior requires a go-around. Failure after will still allow the aircraft to safely land in the touchdown zone. There is no requirement to establish external visual reference at alert height.