Flight Crew Air Transport Pilot (ATP)
Flight Crew Last 90 Days 47; Flight Crew Total 14244; Flight Crew Type 10578
Time Pressure; Situational Awareness; Communication Breakdown; Distraction
Conflict NMAC; Inflight Event / Encounter Unstabilized Approach
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Took Evasive Action; Flight Crew Executed Go Around / Missed Approach
Aircraft; Company Policy; Procedure
On final approach to ZZZ XXL ILS we received a TCAS RA. Normally we get that when an aircraft is on final to XXR. We could not find the other aircraft. We then received an RA to climb and did so. I looked straight below us out the right window and saw the intruder. He was directly below us appearing to also flying to XXL. We got to about 400 feet directly above him before we got the RA. We notified ATC and they responded that the aircraft was on the ILS to XXR. He obviously wasn't. We discontinued the approach and eventually landed on XYR. Fortunately we had not taken the advice on the 10-7 page and selected TA only. If we had; we would have had a midair.
Cleared ILS XXL approach; was not informed that there was an aircraft on XXR; did not hear the aircraft on the XXR approach or the airplane  was not on same frequency. Received a TCAS RA; 1st Officer looked out window and told me that there was an airplane below [us].  Followed TCAS RA; flew the missed approach. Didn't turn the TCAS to TA only because we were on an ILS approach and we were not informed of traffic on XXR.
A320 pilot crew reported receiving an RA on final approach and executing a missed approach. Crew reported RA was late; ATC did not issue traffic advisory and transponder was not in TA only mode as per company policy.