I think the thread may be doomed unless someone like bsieker can re-focus the discussion with analysis of ACARS messages.Its all we've got to go on.What do the messages mean individually?Do they collectively indicate strictly an air data event and not an IR event?Air Caraibe/Qantas valid parallels or not?Presumably the ACARS messages indicate what ECAM messages the crew faced?Which ECAM messages were seen in Air Caraibe and Qantas?Commonality to AF447?ISIS fault interpretation?Air data only or possibly gyro-related,ie did that crew have attitude data?Robustness of RLG in severe turbulence?Power supply of ISIS?ESS bus or HOT BAT?Rudder travel limit controlled by airspeed but what if CAS was erroneous.Could RTL theoretically give FULL deflection at cruise altitude?Sensitivity of A330 rudder control system?Side-stick issues in severe turbulence..inadvertent input,conflicting dual pilot input.