Narrative:

Upon arrival in dfw terminal area, flight was cleared for ILS runway 17L approach. While manually tracking localizer inbound and approximately coincident with GS intercept, we received a TCASII descend, descend now RA. Because RA was received coincident with GS intercept, we started down the GS while simultaneously complying with RA. FMA changed from GS and localizer to vertical speed and heading select respectively requiring reselection of land mode while descending on GS between approximately 1000 ft and 800 ft afl. Upon reaching decision ht, flight experienced heavy precipitation resulting in loss of contact with runway environment resulting in an uneventful missed approach followed by radar vectors for an ILS runway 18R approach. At 3000 ft MSL, shortly after capturing ILS runway 18R localizer well before GS intercept, we again received a descend, descend now TCASII RA. An immediate descent was initiated and ATC was notified we were descending in response to a TCASII RA. ATC responded by directing us to descend immediately to 2200 ft. ATC direction was complied with while simultaneously making visual contact with slightly higher opposite direction jet traffic. Unsure of lateral or vertical separation but seemed to be minimal. Land mode was immediately reengaged but separation from preceding aircraft subsequently became too small resulting in an ATC directed go around. An uneventful third approach and landing on runway 18R was subsequently conducted without further incident.

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Original NASA ASRS Text

Title: FK100 ACFT ON APCH HAD TCASII RA ON APCH, TOOK EVASIVE ACTION AND THEN GAR. NEXT APCH ON DIFFERENT RWY HAD ANOTHER TCASII RA AND AGAIN EVADED WITH CTLR INSTRUCTING AN IMMEDIATE DSCNT, BUT RESULTING IN ANOTHER GAR.

Narrative: UPON ARR IN DFW TERMINAL AREA, FLT WAS CLRED FOR ILS RWY 17L APCH. WHILE MANUALLY TRACKING LOC INBOUND AND APPROX COINCIDENT WITH GS INTERCEPT, WE RECEIVED A TCASII DSND, DSND NOW RA. BECAUSE RA WAS RECEIVED COINCIDENT WITH GS INTERCEPT, WE STARTED DOWN THE GS WHILE SIMULTANEOUSLY COMPLYING WITH RA. FMA CHANGED FROM GS AND LOC TO VERT SPD AND HEADING SELECT RESPECTIVELY REQUIRING RESELECTION OF LAND MODE WHILE DSNDING ON GS BTWN APPROX 1000 FT AND 800 FT AFL. UPON REACHING DECISION HT, FLT EXPERIENCED HVY PRECIPITATION RESULTING IN LOSS OF CONTACT WITH RWY ENVIRONMENT RESULTING IN AN UNEVENTFUL MISSED APCH FOLLOWED BY RADAR VECTORS FOR AN ILS RWY 18R APCH. AT 3000 FT MSL, SHORTLY AFTER CAPTURING ILS RWY 18R LOC WELL BEFORE GS INTERCEPT, WE AGAIN RECEIVED A DSND, DSND NOW TCASII RA. AN IMMEDIATE DSCNT WAS INITIATED AND ATC WAS NOTIFIED WE WERE DSNDING IN RESPONSE TO A TCASII RA. ATC RESPONDED BY DIRECTING US TO DSND IMMEDIATELY TO 2200 FT. ATC DIRECTION WAS COMPLIED WITH WHILE SIMULTANEOUSLY MAKING VISUAL CONTACT WITH SLIGHTLY HIGHER OPPOSITE DIRECTION JET TFC. UNSURE OF LATERAL OR VERT SEPARATION BUT SEEMED TO BE MINIMAL. LAND MODE WAS IMMEDIATELY REENGAGED BUT SEPARATION FROM PRECEDING ACFT SUBSEQUENTLY BECAME TOO SMALL RESULTING IN AN ATC DIRECTED GAR. AN UNEVENTFUL THIRD APCH AND LNDG ON RWY 18R WAS SUBSEQUENTLY CONDUCTED WITHOUT FURTHER INCIDENT.

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.