Alexban,
If im not mistaken a TCAD wont give you RA's It simply says where traffic is, as for TCAS it will give you RA's commands... Now could someone confirm this? My knowledge of this 2 systems is limited so i would be greatful if someone could shed some light regarding TCAD's.
AVIACO, responding to your question regarding the fleet replacement, it is schedule to be the A330 to replace their A310 ( According to a few pilots i know from Air Portugal )