CAA questions i take it?
Autothrottle goes to idle at the flare retard command from the Autopilot and thats hopefully before touchdown!! The 747 A/t only dissconnects with reverser application or if the pilot dissconnects it.
At the decision height.
Cat 3B is no decision height. this is the max autoland available at most airports, 3C requires taxi guidance to the gate.
Hope this helps.
Stu.
