Originally Posted by
vilas
When TCAS can't see the traffic it can't trigger RA. You see it and avoid. The question is when TCAS RA is telling you to descend will you ignore it climb instead? Then how do you know what will the guy do? Not following RA is dangerous.
In the situation I’m familiar with, there were 2 intruders, and TCAS issued the RA without knowing about the 2nd aircraft. The crew could not comply with the RA.
An outlier, yes, but technology doesn’t always have the full picture.