Oh dear oh dear !
hedgehog-in-fog:
This is an extract from the
FCOM3 A-319\320 Operating Limitations 3.01.34 p1
of one of Russian airline.It is not recommended to use TCAS II (ACAS) TA/RA mode in flight in former USSR airspace
I sincerely hope that the date on top of this FCOM page is before 2002 ..
CDN_ATC,:
How much lead time does a TCAS RA give? Or is it dependent on the situation?
I do hope that you are not working as a controller in the UAC I am thinking about, seen your profile location. If you do, then we we still a lot of education to do...
In short :
ATC Short term conflict Alert (STCA) is depending on ATS systems, there is no fixed parameter worldwide, but is typically 2 minutes, while ACAS audio warnings are dependent on altitude, but in the upper airspace , they start around 45 seconds before CPA. There are no coordination whatsoever between the 2 systems.