Snowbird wrote:

Newps wrote in message news:dTf1b.167931$cF.58574@rwcrnsc53...

Roy Smith wrote:

Newps wrote:



If the TCAS gives an RA the airliner must take the action
suggested.


Do TCAS RA's take terrain into account?

Yes, the airplane knows how high it is. It will not drive it self into
the ground.


Knowing how high it is, is only part of what's needed -- does it
know where it is, and how high the terrain is nearby?

Doesn't need to know where it is. Only how far above the ground it is
or will be in a few seconds. The TCAS will only tell you to go either
up or down, not right or left.