Narrative:

First officer was flying. This was the 4TH leg of 6 scheduled and flown. Winds were shifting at the denver airport. When we crossed the kiowa VOR, den was departing runway 8 and arriving runway 35L/right. Captain was getting ATIS and talking to company operations. Den approach descended us from 12000 ft to 10000 ft. I answered on the radio and complied on the autoplt, anticipating an approach to runway 35L/right. I was watching the TCASII as the captain got back in the loop and was pointing out a potential conflict when, before the captain could call them, den approach (supervisor I assume) gave us an immediate climb to 11000 ft. I disconnected the autoplt and climbed with full power to 11000 ft. As we left 10000 ft, the TCASII climb command activated. ATC reported the departing aircraft (also an medium large transport saw us visually). We saw them at less than a mi. Closest approach was 1300 ft vertical, 200 horizontal. Overall, I feel everyone did their job. Contributing factors: I was tired. Previous trip was a 7 hour late night followed by 3 consecutive XA00 wake-ups. I got 4 hours of sleep the night before and informed the captain. It was a long, hot day. Procedures were compressed on a short leg. Runways were changing at den from 35L/right to 17L/right. This caused some confusion, I believe. I might have questioned the descent to 10000 ft but I expected an arrival on runway 35L. Callback conversation with reporter revealed the following information: the reporting first officer believes that it was an ATC fault, although both he and his captain were very tired. The crew called TRACON who said that there was no conflict. The crew has heard no more about this from the FAA.

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Original NASA ASRS Text

Title: 2 ACR MLGS HAD A POTENTIAL AIRBORNE CONFLICT THAT WAS RESOLVED BOTH BY TCASII AND APCH CTL.

Narrative: FO WAS FLYING. THIS WAS THE 4TH LEG OF 6 SCHEDULED AND FLOWN. WINDS WERE SHIFTING AT THE DENVER ARPT. WHEN WE CROSSED THE KIOWA VOR, DEN WAS DEPARTING RWY 8 AND ARRIVING RWY 35L/R. CAPT WAS GETTING ATIS AND TALKING TO COMPANY OPS. DEN APCH DSNDED US FROM 12000 FT TO 10000 FT. I ANSWERED ON THE RADIO AND COMPLIED ON THE AUTOPLT, ANTICIPATING AN APCH TO RWY 35L/R. I WAS WATCHING THE TCASII AS THE CAPT GOT BACK IN THE LOOP AND WAS POINTING OUT A POTENTIAL CONFLICT WHEN, BEFORE THE CAPT COULD CALL THEM, DEN APCH (SUPVR I ASSUME) GAVE US AN IMMEDIATE CLB TO 11000 FT. I DISCONNECTED THE AUTOPLT AND CLBED WITH FULL PWR TO 11000 FT. AS WE LEFT 10000 FT, THE TCASII CLB COMMAND ACTIVATED. ATC RPTED THE DEPARTING ACFT (ALSO AN MLG SAW US VISUALLY). WE SAW THEM AT LESS THAN A MI. CLOSEST APCH WAS 1300 FT VERT, 200 HORIZ. OVERALL, I FEEL EVERYONE DID THEIR JOB. CONTRIBUTING FACTORS: I WAS TIRED. PREVIOUS TRIP WAS A 7 HR LATE NIGHT FOLLOWED BY 3 CONSECUTIVE XA00 WAKE-UPS. I GOT 4 HRS OF SLEEP THE NIGHT BEFORE AND INFORMED THE CAPT. IT WAS A LONG, HOT DAY. PROCS WERE COMPRESSED ON A SHORT LEG. RWYS WERE CHANGING AT DEN FROM 35L/R TO 17L/R. THIS CAUSED SOME CONFUSION, I BELIEVE. I MIGHT HAVE QUESTIONED THE DSCNT TO 10000 FT BUT I EXPECTED AN ARR ON RWY 35L. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTING FO BELIEVES THAT IT WAS AN ATC FAULT, ALTHOUGH BOTH HE AND HIS CAPT WERE VERY TIRED. THE CREW CALLED TRACON WHO SAID THAT THERE WAS NO CONFLICT. THE CREW HAS HEARD NO MORE ABOUT THIS FROM THE FAA.

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.