Narrative:

I was the first officer and PNF on a night flight from mdw to dtw. ZOB was controling us and we had been vectored for traffic. We were level at 12000 ft and the last clearance we received was to fly heading 090 degrees to intercept the mizar 3 arrival. We were then handed off to detroit approach control. I attempted to contact approach but received no reply, the controller was busy with other traffic. At this time I became busy with the PNF duties. The captain had the 131 degree radial off lfd set on his HSI and I had the 246 degree radial off carleton set on my HSI. Apparently the captain flew through the lfd 131 degree radial to the northeast side. The RMI confirmed 20 degrees approximately off course. The captain made an immediate right turn to approximately 160 degrees to try to re-intercept the radial. At this time I noticed the crl 246 degree come in and I called 'course active.' the captain began a slow turn back to the left but we had gone through the crl 246 degrees. At this time dtw approach called us saying 'say heading' and then 'turn left to heading 360 degrees and descend to 11000 ft.' the captain made an immediate left turn and descent to 11000 ft. The controller then called out traffic at our 2 O'clock position. We then got a TCASII TA followed immediately by an RA which annunciated, climb. We were already established in a high rate descent so the captain elected to follow the controller's instructions. We later learned that the traffic (air carrier Y) was initially also at 12000 ft but was talking to ZOB and was given a descent to 11000 ft by cleveland. The RA ended within seconds and the flight proceeded normally to dtw. Supplemental information from acn 405262: I was concentrating so hard to intercept lfd 131 degree radial that I flew through crl 246 degree radial. Decided to follow controller's descend command. Did not know that conflicting traffic was being controled by cle, who was telling them to descend also. Supplemental information from acn 405283: after leveloff, had traffic at 12 O'clock position 10 mi. Traffic started to converge. We received the RA and started descent to avoid. Controller then gave directions to climb, we still descended, had visual on traffic. Traffic descended also and was on different frequency. Both aircraft turned to their left to avoid each other.

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Original NASA ASRS Text

Title: DC9 FLC DID NOT INTERCEPT STAR RADIAL, AND IN ATTEMPT TO RETURN TO ASSIGNED COURSE, CAME INTO CONFLICT WITH B727 ON ANOTHER CTL FREQ. BOTH ACFT RECEIVED A TCASII RA. THE DC9 FLC DID NOT FOLLOW TCASII RA, WHILE THE B727 DID, FURTHER COMPOUNDING THE SIT. BOTH ACFT SIGHTED THE OTHER, EXECUTING EVASIVE TURNS.

Narrative: I WAS THE FO AND PNF ON A NIGHT FLT FROM MDW TO DTW. ZOB WAS CTLING US AND WE HAD BEEN VECTORED FOR TFC. WE WERE LEVEL AT 12000 FT AND THE LAST CLRNC WE RECEIVED WAS TO FLY HDG 090 DEGS TO INTERCEPT THE MIZAR 3 ARR. WE WERE THEN HANDED OFF TO DETROIT APCH CTL. I ATTEMPTED TO CONTACT APCH BUT RECEIVED NO REPLY, THE CTLR WAS BUSY WITH OTHER TFC. AT THIS TIME I BECAME BUSY WITH THE PNF DUTIES. THE CAPT HAD THE 131 DEG RADIAL OFF LFD SET ON HIS HSI AND I HAD THE 246 DEG RADIAL OFF CARLETON SET ON MY HSI. APPARENTLY THE CAPT FLEW THROUGH THE LFD 131 DEG RADIAL TO THE NE SIDE. THE RMI CONFIRMED 20 DEGS APPROX OFF COURSE. THE CAPT MADE AN IMMEDIATE R TURN TO APPROX 160 DEGS TO TRY TO RE-INTERCEPT THE RADIAL. AT THIS TIME I NOTICED THE CRL 246 DEG COME IN AND I CALLED 'COURSE ACTIVE.' THE CAPT BEGAN A SLOW TURN BACK TO THE L BUT WE HAD GONE THROUGH THE CRL 246 DEGS. AT THIS TIME DTW APCH CALLED US SAYING 'SAY HEADING' AND THEN 'TURN L TO HDG 360 DEGS AND DSND TO 11000 FT.' THE CAPT MADE AN IMMEDIATE L TURN AND DSCNT TO 11000 FT. THE CTLR THEN CALLED OUT TFC AT OUR 2 O'CLOCK POS. WE THEN GOT A TCASII TA FOLLOWED IMMEDIATELY BY AN RA WHICH ANNUNCIATED, CLB. WE WERE ALREADY ESTABLISHED IN A HIGH RATE DSCNT SO THE CAPT ELECTED TO FOLLOW THE CTLR'S INSTRUCTIONS. WE LATER LEARNED THAT THE TFC (ACR Y) WAS INITIALLY ALSO AT 12000 FT BUT WAS TALKING TO ZOB AND WAS GIVEN A DSCNT TO 11000 FT BY CLEVELAND. THE RA ENDED WITHIN SECONDS AND THE FLT PROCEEDED NORMALLY TO DTW. SUPPLEMENTAL INFO FROM ACN 405262: I WAS CONCENTRATING SO HARD TO INTERCEPT LFD 131 DEG RADIAL THAT I FLEW THROUGH CRL 246 DEG RADIAL. DECIDED TO FOLLOW CTLR'S DSND COMMAND. DID NOT KNOW THAT CONFLICTING TFC WAS BEING CTLED BY CLE, WHO WAS TELLING THEM TO DSND ALSO. SUPPLEMENTAL INFO FROM ACN 405283: AFTER LEVELOFF, HAD TFC AT 12 O'CLOCK POS 10 MI. TFC STARTED TO CONVERGE. WE RECEIVED THE RA AND STARTED DSCNT TO AVOID. CTLR THEN GAVE DIRECTIONS TO CLB, WE STILL DSNDED, HAD VISUAL ON TFC. TFC DSNDED ALSO AND WAS ON DIFFERENT FREQ. BOTH ACFT TURNED TO THEIR L TO AVOID EACH OTHER.

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.