Narrative:

After assigning flight an intercept heading and clearance for the ILS 4 approach to deadhorse, the center controller issued traffic at 11 O'clock and 5 mi with an unverified altitude of 600 ft. This coincided with TCASII traffic. After acknowledging this, the controller told us to contact deadhorse radio. We contacted radio approximately 2 mi from the final approach fix (cimas). After our call to radio, an aircraft called radio and gave their position and altitude. This report was consistent with the TCASII target. After crossing the final approach fix, on GS and localizer, we asked the aircraft to verify their position and altitude. They complied and again this was verified by the TCASII. As we were descending on the GS at approximately 1300 ft MSL the TCASII issued a TA, followed almost simultaneously by an RA. We complied with the RA and configured for the missed approach. We then spotted the traffic and verified that they had us in sight. They confirmed that they had us in sight and were going to maneuver to the left to overfly the airport and enter the right downwind to land on runway 4. The TCASII issued a 'clear of traffic' alert as the aircraft was maneuvering to the left in order to fly overhead the airport. The TA and RA and 'clear of traffic' announcement occurred in very quick succession. Our flight passed approximately 600 ft higher than and within approximately 3/4 of a mi horizontally from the aircraft. The separation was the equivalent to the separation that would have occurred during landing on parallel runways at a tower controled airport. The WX at the time of this occurrence was reported to be ceiling of 1000 ft and visibility of 7 mi.

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Original NASA ASRS Text

Title: DURING AN ILS APCH, FLC OF AN ACR MLG ACFT TOOK EVASIVE ACTION IN RESPONSE TO A TCASII RA.

Narrative: AFTER ASSIGNING FLT AN INTERCEPT HDG AND CLRNC FOR THE ILS 4 APCH TO DEADHORSE, THE CTR CTLR ISSUED TFC AT 11 O'CLOCK AND 5 MI WITH AN UNVERIFIED ALT OF 600 FT. THIS COINCIDED WITH TCASII TFC. AFTER ACKNOWLEDGING THIS, THE CTLR TOLD US TO CONTACT DEADHORSE RADIO. WE CONTACTED RADIO APPROX 2 MI FROM THE FINAL APCH FIX (CIMAS). AFTER OUR CALL TO RADIO, AN ACFT CALLED RADIO AND GAVE THEIR POS AND ALT. THIS RPT WAS CONSISTENT WITH THE TCASII TARGET. AFTER XING THE FINAL APCH FIX, ON GS AND LOC, WE ASKED THE ACFT TO VERIFY THEIR POS AND ALT. THEY COMPLIED AND AGAIN THIS WAS VERIFIED BY THE TCASII. AS WE WERE DSNDING ON THE GS AT APPROX 1300 FT MSL THE TCASII ISSUED A TA, FOLLOWED ALMOST SIMULTANEOUSLY BY AN RA. WE COMPLIED WITH THE RA AND CONFIGURED FOR THE MISSED APCH. WE THEN SPOTTED THE TFC AND VERIFIED THAT THEY HAD US IN SIGHT. THEY CONFIRMED THAT THEY HAD US IN SIGHT AND WERE GOING TO MANEUVER TO THE L TO OVERFLY THE ARPT AND ENTER THE R DOWNWIND TO LAND ON RWY 4. THE TCASII ISSUED A 'CLR OF TFC' ALERT AS THE ACFT WAS MANEUVERING TO THE L IN ORDER TO FLY OVERHEAD THE ARPT. THE TA AND RA AND 'CLR OF TFC' ANNOUNCEMENT OCCURRED IN VERY QUICK SUCCESSION. OUR FLT PASSED APPROX 600 FT HIGHER THAN AND WITHIN APPROX 3/4 OF A MI HORIZLY FROM THE ACFT. THE SEPARATION WAS THE EQUIVALENT TO THE SEPARATION THAT WOULD HAVE OCCURRED DURING LNDG ON PARALLEL RWYS AT A TWR CTLED ARPT. THE WX AT THE TIME OF THIS OCCURRENCE WAS RPTED TO BE CEILING OF 1000 FT AND VISIBILITY OF 7 MI.

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.