Originally posted by HazelNuts39 ...
It would be of interest to know the tolerance of the “credibility” test of the monitoring process internal to the TCAS which applies to the standard altitude parameter. It shouldn't be too difficult for the BEA to get that from the TCAS manufacturer.
It took until the Report #2 for relevance of that ACARS message to be interpreted, which supprises me, on the basis that it appears to have been a non documented routine.