1) Does anyone know why AP disconnected at 02:10:05 ?
According to NTSB (and AI), see :
DCA09IA064 : "
According to Airbus documentation and analysis, if an airspeed discrepancy of more than 20kts or an altitude discrepancy of more than 400ft is detected between one ADR and the two others, the subject ADR is rejected. Then if a discrepancy occurs between the two remaining ADR, all auto flight functions are lost and autopilot, flight director, and autothrust disconnect.".
I do not see any discrepancy between the two recorded AS before, at least, 02:10:07.5.
In the TAM case : "
the No.1 ADR airspeed dropped rapidly from about 260 knots to approximately 60 knots for a few seconds, then rose to 100 knots. At the same time, the recorded pressure altitude dropped by about 300 feet. About one minute later, the autothrust and autopilot disengaged..."
Why such a hasty AP disconnection in the AF 447 case ?
2) Why did the "
NAV ADR DISAGREE... IF SPD DISAGREE... ADR CHECK PROC... APPLY " ECAM message came in as late as 02:12:XX ?