MR8,
Excellent.Either they had dual ADR failure and didnt fly the correct IAS on the standby ASI(or whatever Airbus call it) or they had all 3 go down and had to fly pitch/N1 using GPS-generated GS(which as you say would be suicidal given the conditions).
How does an Airbus pilot set the thrust for best turb-penetration speed?On a Boeing with moving thrust levers,we simply disengage and set FMC-generated TURB N1 and leave it there.Would the overspeed warning be on continuously in the assumed scenario?
The question though is how/why they flew into such weather.Shouldnt this be the subject of the first advisory from Airbus?