ECAM on the AF447, for 2 minutes and 39 seconds there was no message NAV ADR DISAGREE or NAV ADR DISCREPANCY
an ADR is rejected by the EFCS if the CAS difference > 16kts for 10s compared to the median value.
The remaining ADRs are compared to the average value > 16kts for 1s.
If true then the NAV ADR DISAGREE is set.
Since the message was only set after 2 min 39s this means that the above values were not exceeded before.
Remember the RH display was switched to ADR 3 at 02:10:40.
NAV ADR DISCREPANCY does not exist.
a DISCREPANCY message is preceded by a parameter, e.g. NAV IAS DISCREPANCY or NAV AOA DISCREPANCY.
The availability of this message (IAS) depend of the installed FWC standard.