praise to all you rotorheads that can see the benefit of TCAS.2
but remember this Its only a fail safe and it doesn't always get it right.
Both have to have functioning transponders that are switched on! for at least the A/c with ACAS fitted to see the other. If its only sq mode a then which way do you go???????

and it will only give a TA effectively below 1A. the other thing is How many mill a/c do you know with TCAS fitted?
Yes it has to be of benefit and all praise to the BHL boys for pushing it through thats if it gets there, and one in the eye

for the yanks how said it couldn't be done all those years ago.