Mike Schumann opined

The fact that neither aircraft had a TCAS warning was a very significant
contributor to the accident. Given that both aircraft were virtually brand
new, this raises a lot of questions.


Doesn't TCAS need surrounding transponders to be interogated by radar?

If so, then does TCAS work in an area without radar coverage?



-ash
Cthulhu in 2005!
Why wait for nature?