thanks
We fly our Boeing 737 series (we have almost every versions except the really old ones) down to CAT III a Fail passive DH 50 RVR 200/125/125 (it has two autopilots).
Our Boeing 747-400 same autoflight system as the Boeing 767-300ER also has the downgrade Land 2/No land 3 down to CAT III a Fail passive DH 50 RVR's 300/125/75.
I remember the DC-10-30 that we had were CAT III b auto-rollout with two autopilots but they were dual channel, don't believe ours are. It is not becoming clearer to me, yet. Would love to hear what Boeing says.