while we're on the subject...a very basic question regarding TCAS and reduced separation.
I understand TCAS is limited to TA only when in landing config, to avoid the issue of RA against traffic they are visual with (or even on the ground).
Let's say we're flying higher up, not in landing config, say VMC climb or descent, or IFR vs VFR sort of thing, all perfectly legal and in which 2 aircraft could get very close to each other. What does the pilot do if issued an RA against traffic he's visual with?