Apperently, when a TA occurs, we are not suppose to make any changes to the vertical plane so that we can allow the TCAS to do the calculation.
Sounds logical if there's more than 1 conflicting traffic.
That's an interesting one. Does everyone do this? I can think of many occasions where doing something after a TA is a good idea to avoid an RA: e.g. a steep climb or descent. You see the TA, maybe the TFC even before a TA; note its reletive level and clb or desc profile, and adjust yoiur profile accordingly. Is this not common conflict preventation airmanship?