Narrative:

Arriving from the northwest, we were given a late descent into the den area. We called field in sight as we approached the localizer on a 090 degree heading. We were then given clearance for a visual approach and in the turn to 170 degrees, we went slightly through the localizer to the east of centerline. We were correcting slowly back to centerline on ATC assigned speed of 170 KTS. We received a TA for traffic at our 5 O'clock position and I acquired the traffic visually. The high wing turboprop was drifting to our 6 O'clock position about 500 ft below us. We received a monitor vertical speed warning and complied with guidance on ADI. The warning ceased and we continued the approach intercepting the centerline about 1200 ft AGL. The captain notified approach control of the first RA and approach switched us to tower without acknowledging our RA. We went over to tower and then received a climb RA on the same target. We followed guidance until warning ceased and decided that since we were too high to continue and did not have the traffic in sight, so we initiated a go around. After block-in, the captain called dispatch and den approach. Approach said that they have had a lot of RA's with the new runway and that they were not concerned with a loss of separation. Approach also said that the controller working at the time was not available and said that the controller had told him that the turboprop had not deviated east of the runway 16R centerline. We received the TA and the first RA while east of the runway 16L. Centerline and correcting. We received the second RA while on the runway 16L centerline. Supplemental information from acn 600341: den approach gave us 30 degrees intercept to intercept localizer runway 16R inbound. Prior to course coming alive, received visual clearance and asked/told to contact tower. PF's HSI did not capture localizer (correct frequency and course were selected). Subsequently flew through final and corrected back. However, caused conflict with aircraft arrival for runway 16L. Had this aircraft in sight entire approach, but came close enough for both TCASII system to alert for RA. Responded in accordance with company procedures with no further TCASII alerts.

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Original NASA ASRS Text

Title: A B757 AND DHC6 BOTH OVERSHOT TURN TO FINAL DURING VISUAL APCH TO DEN AND RECEIVE TCASII RA'S.

Narrative: ARRIVING FROM THE NW, WE WERE GIVEN A LATE DSCNT INTO THE DEN AREA. WE CALLED FIELD IN SIGHT AS WE APCHED THE LOC ON A 090 DEG HDG. WE WERE THEN GIVEN CLRNC FOR A VISUAL APCH AND IN THE TURN TO 170 DEGS, WE WENT SLIGHTLY THROUGH THE LOC TO THE E OF CTRLINE. WE WERE CORRECTING SLOWLY BACK TO CTRLINE ON ATC ASSIGNED SPD OF 170 KTS. WE RECEIVED A TA FOR TFC AT OUR 5 O'CLOCK POS AND I ACQUIRED THE TFC VISUALLY. THE HIGH WING TURBOPROP WAS DRIFTING TO OUR 6 O'CLOCK POS ABOUT 500 FT BELOW US. WE RECEIVED A MONITOR VERT SPD WARNING AND COMPLIED WITH GUIDANCE ON ADI. THE WARNING CEASED AND WE CONTINUED THE APCH INTERCEPTING THE CTRLINE ABOUT 1200 FT AGL. THE CAPT NOTIFIED APCH CTL OF THE FIRST RA AND APCH SWITCHED US TO TWR WITHOUT ACKNOWLEDGING OUR RA. WE WENT OVER TO TWR AND THEN RECEIVED A CLB RA ON THE SAME TARGET. WE FOLLOWED GUIDANCE UNTIL WARNING CEASED AND DECIDED THAT SINCE WE WERE TOO HIGH TO CONTINUE AND DID NOT HAVE THE TFC IN SIGHT, SO WE INITIATED A GAR. AFTER BLOCK-IN, THE CAPT CALLED DISPATCH AND DEN APCH. APCH SAID THAT THEY HAVE HAD A LOT OF RA'S WITH THE NEW RWY AND THAT THEY WERE NOT CONCERNED WITH A LOSS OF SEPARATION. APCH ALSO SAID THAT THE CTLR WORKING AT THE TIME WAS NOT AVAILABLE AND SAID THAT THE CTLR HAD TOLD HIM THAT THE TURBOPROP HAD NOT DEVIATED E OF THE RWY 16R CTRLINE. WE RECEIVED THE TA AND THE FIRST RA WHILE E OF THE RWY 16L. CTRLINE AND CORRECTING. WE RECEIVED THE SECOND RA WHILE ON THE RWY 16L CTRLINE. SUPPLEMENTAL INFO FROM ACN 600341: DEN APCH GAVE US 30 DEGS INTERCEPT TO INTERCEPT LOC RWY 16R INBOUND. PRIOR TO COURSE COMING ALIVE, RECEIVED VISUAL CLRNC AND ASKED/TOLD TO CONTACT TWR. PF'S HSI DID NOT CAPTURE LOC (CORRECT FREQ AND COURSE WERE SELECTED). SUBSEQUENTLY FLEW THROUGH FINAL AND CORRECTED BACK. HOWEVER, CAUSED CONFLICT WITH ACFT ARR FOR RWY 16L. HAD THIS ACFT IN SIGHT ENTIRE APCH, BUT CAME CLOSE ENOUGH FOR BOTH TCASII SYS TO ALERT FOR RA. RESPONDED IN ACCORDANCE WITH COMPANY PROCS WITH NO FURTHER TCASII ALERTS.

Data retrieved from NASA's ASRS site as of July 2007 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.