Narrative:

Captain PF; during the descent and approach to final into denver international airport. We were arriving from the east on radar vectors to the airport. WX was cavu while on a modified left base to final to runway 16L. I called 'field in sight' and ATC assigned us a heading to intercept final to runway 16L due to arriving traffic from the west which will be landing on the parallel runway 16R. We were then cleared for the visual approach to runway 16L without any further mention or advisories about the opposite direction traffic (crj) which would be landing on the parallel runway. I assumed that since both the captain and I had visual contact with the runway that he was going to visually fly the aircraft to intercept final to runway 16L. Unbeknownst to me; he was going to wait to fly the flight director when it captured the localizer. However; he had forgotten to arm the localizer and GS (select approach). I then noticed that we were now flying through the localizer/runway centerline for runway 16L and beginning to encroach in the runway 16R airspace. I then immediately stated to him that we were flying through our runway centerline and he then noticed he hadn't armed up the approach. He then aggressively turned the aircraft back toward our runway. It was at about this time that we began to receive a TCAS RA 'monitor vertical speed' (although I don't recall the exact RA verbiage). However; our vsi's displayed all red for climb. We never made any visual contact with the other aircraft and we were not certain that the other aircraft had us visually either. Both aircraft landed without further incident and neither ATC nor the other aircraft involved mentioned a single word about the conflict.

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Original NASA ASRS Text

Title: A B757 CREW OVERSHOT DEN RWY 16L LOC BECAUSE THE FLT DIRECTOR WAS NOT ARMED AND RECEIVED A TCAS RA FROM THE ACFT ON DEN RWY 16R APCH.

Narrative: CAPT PF; DURING THE DSCNT AND APCH TO FINAL INTO DENVER INTL ARPT. WE WERE ARRIVING FROM THE E ON RADAR VECTORS TO THE ARPT. WX WAS CAVU WHILE ON A MODIFIED L BASE TO FINAL TO RWY 16L. I CALLED 'FIELD IN SIGHT' AND ATC ASSIGNED US A HDG TO INTERCEPT FINAL TO RWY 16L DUE TO ARRIVING TFC FROM THE W WHICH WILL BE LNDG ON THE PARALLEL RWY 16R. WE WERE THEN CLRED FOR THE VISUAL APCH TO RWY 16L WITHOUT ANY FURTHER MENTION OR ADVISORIES ABOUT THE OPPOSITE DIRECTION TFC (CRJ) WHICH WOULD BE LNDG ON THE PARALLEL RWY. I ASSUMED THAT SINCE BOTH THE CAPT AND I HAD VISUAL CONTACT WITH THE RWY THAT HE WAS GOING TO VISUALLY FLY THE ACFT TO INTERCEPT FINAL TO RWY 16L. UNBEKNOWNST TO ME; HE WAS GOING TO WAIT TO FLY THE FLT DIRECTOR WHEN IT CAPTURED THE LOC. HOWEVER; HE HAD FORGOTTEN TO ARM THE LOC AND GS (SELECT APCH). I THEN NOTICED THAT WE WERE NOW FLYING THROUGH THE LOC/RWY CTRLINE FOR RWY 16L AND BEGINNING TO ENCROACH IN THE RWY 16R AIRSPACE. I THEN IMMEDIATELY STATED TO HIM THAT WE WERE FLYING THROUGH OUR RWY CTRLINE AND HE THEN NOTICED HE HADN'T ARMED UP THE APCH. HE THEN AGGRESSIVELY TURNED THE ACFT BACK TOWARD OUR RWY. IT WAS AT ABOUT THIS TIME THAT WE BEGAN TO RECEIVE A TCAS RA 'MONITOR VERT SPD' (ALTHOUGH I DON'T RECALL THE EXACT RA VERBIAGE). HOWEVER; OUR VSI'S DISPLAYED ALL RED FOR CLB. WE NEVER MADE ANY VISUAL CONTACT WITH THE OTHER ACFT AND WE WERE NOT CERTAIN THAT THE OTHER ACFT HAD US VISUALLY EITHER. BOTH ACFT LANDED WITHOUT FURTHER INCIDENT AND NEITHER ATC NOR THE OTHER ACFT INVOLVED MENTIONED A SINGLE WORD ABOUT THE CONFLICT.

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.