Narrative:

After we clear for a visual approach to runway 16L; just outside the marker we had TCAS traffic and then RA monitor vertical speed climb. An rj on the approach to runway 16R; I had the aircraft in sight all the time. First officer (PNF) initiated a go around ATC advised. The rj continued the approach for runway 16R. Supplemental information from acn 724383: while on a visual approach to runway 16L. Both captain and I observed an rj flying south towards den at approximately same altitude and slightly behind us. As we joined the localizer we received 2 TCAS RA's to 'adjust vertical speed.' after the second RA not sure if the captain had the traffic in sight and there not being enough time to discuss whether he did or not I became uncomfortable with distance the rj was to our aircraft. I (first officer) took the aircraft by pushing the red and followed the RA instructions. We did a go around and returned for a normal landing.

Google
 

Original NASA ASRS Text

Title: A320 ON VISUAL APCH TO RWY 16L GOES AROUND FOR TCAS RA ON TFC FOR RWY 16R. CAPT FLYING WITH TFC IN SIGHT AND THE FO MAKING THE GAR.

Narrative: AFTER WE CLR FOR A VISUAL APCH TO RWY 16L; JUST OUTSIDE THE MARKER WE HAD TCAS TFC AND THEN RA MONITOR VERT SPD CLB. AN RJ ON THE APCH TO RWY 16R; I HAD THE ACFT IN SIGHT ALL THE TIME. FO (PNF) INITIATED A GAR ATC ADVISED. THE RJ CONTINUED THE APCH FOR RWY 16R. SUPPLEMENTAL INFO FROM ACN 724383: WHILE ON A VISUAL APCH TO RWY 16L. BOTH CAPT AND I OBSERVED AN RJ FLYING S TOWARDS DEN AT APPROX SAME ALT AND SLIGHTLY BEHIND US. AS WE JOINED THE LOC WE RECEIVED 2 TCAS RA'S TO 'ADJUST VERT SPD.' AFTER THE SECOND RA NOT SURE IF THE CAPT HAD THE TFC IN SIGHT AND THERE NOT BEING ENOUGH TIME TO DISCUSS WHETHER HE DID OR NOT I BECAME UNCOMFORTABLE WITH DISTANCE THE RJ WAS TO OUR ACFT. I (FO) TOOK THE ACFT BY PUSHING THE RED AND FOLLOWED THE RA INSTRUCTIONS. WE DID A GAR AND RETURNED FOR A NORMAL LNDG.

Data retrieved from NASA's ASRS site as of January 2009 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.