Narrative:

Msp to cos on aug/tue/99. We were in an A320 aircraft flying the ILS/DME approach to runway 17L at colorado springs. The time was approximately XA15 pm local. The autoplt and autothrust system were engaged and the airplane was coupled up to the ILS. At approximately 1000 ft AGL, 3 mi from the end of the runway, I noticed something out of the corner of my left side window. I turned my head and saw a small, low-wing, single-engine airplane heading right towards us. The aircraft was heading approximately 270 degrees magnetic, 90 degrees or so to my heading, slightly above our altitude. Our TCASII warning system did not go off or issue any warning, nor was the traffic displayed. It appeared to me that the aircraft did not see us and was on a heading that could come very close to hitting us. I immediately disconnected the autoplt and banked my aircraft to the right and descended. I lost approximately 200 ft in the avoidance maneuver and turned approximately 20 degrees off heading. I then leveled my wings and saw that the traffic aircraft was going to pass above us, slightly behind us. I then corrected back to the ILS localizer and GS and landed normally. I asked the tower controller at cos twice about the traffic aircraft before we touched down on the runway, but we received no response at all from tower. It appeared that the traffic aircraft continued on a 270 degree course and turned a left base for the parallel runway 17R and landed a few mins after us. It appeared that his call sign was aircraft Y. I asked the tower/ground controllers if this was true, but they would not respond. After arriving at the gate, I called the tower and spoke to the supervisor on duty and he said that he was informed that aircraft Y had some radio/electrical problems and also had no transponder. He said that aircraft Y was talking on a backup hand-held radio. I asked the supervisor if the cos tower had radar, and he replied that yes they did and that he believed that the conflicting traffic aircraft should have been on their radar as at least a 'primary target.' I asked if the tower would normally call out such traffic to an airliner on an ILS approach and he replied yes. I notified the supervisor of my requirement to report this near midair to my chief dispatcher and chief pilot, and to also fill out an ASR report.

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Original NASA ASRS Text

Title: A320 HAS NMAC WITH UNRPTED AND NOT TCASII TFC WHILE ON ILS APCH INTO COS.

Narrative: MSP TO COS ON AUG/TUE/99. WE WERE IN AN A320 ACFT FLYING THE ILS/DME APCH TO RWY 17L AT COLORADO SPRINGS. THE TIME WAS APPROX XA15 PM LCL. THE AUTOPLT AND AUTOTHRUST SYS WERE ENGAGED AND THE AIRPLANE WAS COUPLED UP TO THE ILS. AT APPROX 1000 FT AGL, 3 MI FROM THE END OF THE RWY, I NOTICED SOMETHING OUT OF THE CORNER OF MY L SIDE WINDOW. I TURNED MY HEAD AND SAW A SMALL, LOW-WING, SINGLE-ENG AIRPLANE HEADING RIGHT TOWARDS US. THE ACFT WAS HEADING APPROX 270 DEGS MAGNETIC, 90 DEGS OR SO TO MY HEADING, SLIGHTLY ABOVE OUR ALT. OUR TCASII WARNING SYS DID NOT GO OFF OR ISSUE ANY WARNING, NOR WAS THE TFC DISPLAYED. IT APPEARED TO ME THAT THE ACFT DID NOT SEE US AND WAS ON A HEADING THAT COULD COME VERY CLOSE TO HITTING US. I IMMEDIATELY DISCONNECTED THE AUTOPLT AND BANKED MY ACFT TO THE R AND DSNDED. I LOST APPROX 200 FT IN THE AVOIDANCE MANEUVER AND TURNED APPROX 20 DEGS OFF HEADING. I THEN LEVELED MY WINGS AND SAW THAT THE TFC ACFT WAS GOING TO PASS ABOVE US, SLIGHTLY BEHIND US. I THEN CORRECTED BACK TO THE ILS LOC AND GS AND LANDED NORMALLY. I ASKED THE TWR CTLR AT COS TWICE ABOUT THE TFC ACFT BEFORE WE TOUCHED DOWN ON THE RWY, BUT WE RECEIVED NO RESPONSE AT ALL FROM TWR. IT APPEARED THAT THE TFC ACFT CONTINUED ON A 270 DEG COURSE AND TURNED A L BASE FOR THE PARALLEL RWY 17R AND LANDED A FEW MINS AFTER US. IT APPEARED THAT HIS CALL SIGN WAS ACFT Y. I ASKED THE TWR/GND CTLRS IF THIS WAS TRUE, BUT THEY WOULD NOT RESPOND. AFTER ARRIVING AT THE GATE, I CALLED THE TWR AND SPOKE TO THE SUPVR ON DUTY AND HE SAID THAT HE WAS INFORMED THAT ACFT Y HAD SOME RADIO/ELECTRICAL PROBS AND ALSO HAD NO XPONDER. HE SAID THAT ACFT Y WAS TALKING ON A BACKUP HAND-HELD RADIO. I ASKED THE SUPVR IF THE COS TWR HAD RADAR, AND HE REPLIED THAT YES THEY DID AND THAT HE BELIEVED THAT THE CONFLICTING TFC ACFT SHOULD HAVE BEEN ON THEIR RADAR AS AT LEAST A 'PRIMARY TARGET.' I ASKED IF THE TWR WOULD NORMALLY CALL OUT SUCH TFC TO AN AIRLINER ON AN ILS APCH AND HE REPLIED YES. I NOTIFIED THE SUPVR OF MY REQUIREMENT TO RPT THIS NEAR MIDAIR TO MY CHIEF DISPATCHER AND CHIEF PLT, AND TO ALSO FILL OUT AN ASR RPT.

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.