Safetypee, tell me what airplanes use groundspeed as a component of AT operations? I'm not aware of anything in the MD11 that does this and neither the B777 or 787 use groundspeed in their algorithm architecture. Maybe it's an Airbus feature? The 777/787 use a different solutions for airspeed with the 787 using static anolog pressure put through the ADRS and coming out as "voted airspeed" which is used by the AT's. In either case there is no groundspeed vector applied to the AT solutions.