TCAS when holding short


#1

When an ac is holding short will its TCAS issue a warning when landing ac fly past them on the way to touchdown ?
I’ve traveled in the cockpit several times but this thought never occurred to me.
If there is a warning I wonder what it would sound like.
Obviously not Climb or Descent.
Thanks in advance.


#2

You’ll see them on the TCAS screen but you won’t get a traffic alert. The aircraft knows its on the ground


#3

Thank you.


#4

At what point do you switch the transponder from standby and doesn’t that start the interaction with TCAS?

J


#5

Depends on the airport Jim. some airports now have ground radar and they require a transponder to be turned on anytime you are taxiing. The TCAS will show traffic when the transponder is selected to TA or TA/RA but warnings are inhibited at low altitudes and on the ground.


#6

My Transponder is ALWAYS on.

2 switches in my jet that never get turned off-

  1. Transponder
  2. Nav lights

FYI- My TCAS is integrated into the avionics so I don’t choose TA/RA on my Transponder. It’s just a small switch to choose transponder #1 and #2.
The Aircraft knows its on the ground because of the WOW stitch.