B737-700
Flight Crew Air Transport Pilot (ATP)
Human-Machine Interface; Confusion; Situational Awareness
Aircraft Equipment Problem Less Severe; Inflight Event / Encounter Other / Unknown
Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory
Human Factors; Company Policy; Aircraft; Airspace Structure
On the Charted Visual Approach Arrival into ATC advised traffic on approach to the parallel runway. We advised we had a visual on the other aircraft. ATC turned us off the arrival with a vector 155 degrees towards the other aircraft; advising us he would turn us back onto the Localizer after passing thru the Localizer. When we were vectored back onto the Localizer and cleared for the Visual Approach; it placed us exactly paralleling the other carrier aircraft. We had discussed and then placed the transponder in TA. Approaching the FAF we received a DESCEND RA. We descended as instructed following the RA. The other aircraft was descending with us so it gave another RA. I placed the transponder in ALT only attempting to silence the RA as we had a visual on the other aircraft and it should not have been sounding an RA in TA. We continued descending and landed uneventfully.
B737-700 Captain reported they received an RA for parallel runway traffic even though their TCAS was in 'TA' mode.