TCAS FAULT message
BEA Interim Report No.2, 1.6.11.6 Consequences of a drop in the measured total pressure, explains that a sudden drop in measured total pressure entails a sudden drop (300 ft) in indicated altitude, due to the correction of the static pressure.
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.
Regards,
HN39
Last edited by HazelNuts39; 8th Apr 2011 at 07:09.