Originally Posted by jmcmanna

I am looking for some information on how TCAS works relatively close to the ground. I know that at some point it no longer gives RAs, but I am under the impression that when that happens could be different under different circumstances.

Specifically, a new RNAV approach goes through an unofficial VFR corridor below some class B airspace that commonly has aircraft transitioning around 1000' to 2000' AGL. Aircraft on the approach (mostly medium-sized airliners) will go through the area around 2500' AGL and below.

From an ATC standpoint, I am curious if, at those altitudes, I can expect RA's and climbs, or are pilots going to receive TCAS advisories as if they were in the pattern at the airport?