Originally Posted by FLX/MCT
Can the use of Transponder on the ground be the cause of a TCAS TA/RA or is there a special "ground mode"?
Private pilot speaking...I understand that most modern systems automatically switch to TA ONLY below 1000ft RA to inhibit nuisance warnings. I'm guessing that the system logic would look at the altitude and speed of the target to determine if it's on the ground, but that's pure speculation.