And it seems the Aussies set TA on the PRM approaches (as we already do on SFO/LAX type close parallel approaches) but the FAA has not addressed this issue and is happy for pilots to leave the transponder in RA/TA. (
Link to other thread). Our company training is following the "no comment" from the FAA other than to say if a TCAS resolution is triggered during a PRM approach then the heading should be flown according to the PRM controller but the TCAS vertical guidance overrides.
I'm still concerned about using TA on traditional parallel approaches but then
not on closer PRM runways. Despite the controllers best efforts, surely the TCAS is going to get twitchy about the other aircraft?