Originally Posted by
Uplinker
I would say the DH is the (final) point at which you elect to continue the autoland, or go-around, and even with a DH of 0 ft there is still the rollout tracking and stopping part of the autoland left to go. If the aircraft landed way off to one side of the runway (or even the grass) instead of on the runway centreline, you might elect to go-around, even though you had "landed".
If on a CAT3B
fail operational approach and autoland, with no adverse annunciations, there still exists, for your ac type/autopilot technology, a `risk` from historical data of not landing on the centreline, then the pilot needs to be given a `casting vote` in the form of a
DH>0. Even if its just 12 ft, which I believe was used by the Trident ac on occasions?