Narrative:

I was flying as the first officer on a flight to atl. We were being vectored to an ILS to runway 9R. The WX was marginal, ceiling 300 ft overcast, wind varying 140-210 degrees at 12 KTS gusting to 18 KTS. Approach advised that a 15 degree cut into the wind was needed to hold final. We were at 5000 ft MSL, heading 180 degrees, with autoplt coupled up to ILS runway 9R. Due to the heavy wind, we were given a vector of 150 degrees to join the localizer, cleared for the approach. The autoplt quickly captured the localizer and made a hard turn to the left to keep centered. Coupled with the strong wind, we blew through the localizer to the north. The autoplt struggled but corrected back. Just prior to re-centering, we captured the GS and began a slow descent to the OM. After just passing 3500 ft MSL, we experienced a huge descent and degrading performance followed by a windshear warning and, seconds later, a GPWS warning. We immediately began a go around on the first warning, but did not arrest the descent until 1000 ft low. Tower immediately reported our 'low altitude' warning, followed by a LLWAS alert then by a 'microburst' alert. Total time from onset to recovery was 15 seconds maximum. Our go around took us out to the south (180 degree heading) then out to the west (270 degree heading). Altitude control was impossible for the next 5+ mins -- +/-200 ft until we climbed to 5000 ft MSL. 20 mins later, everything settled out.

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Original NASA ASRS Text

Title: WINDSHEAR ENCOUNTER ON APCH TO ATL, GA.

Narrative: I WAS FLYING AS THE FO ON A FLT TO ATL. WE WERE BEING VECTORED TO AN ILS TO RWY 9R. THE WX WAS MARGINAL, CEILING 300 FT OVCST, WIND VARYING 140-210 DEGS AT 12 KTS GUSTING TO 18 KTS. APCH ADVISED THAT A 15 DEG CUT INTO THE WIND WAS NEEDED TO HOLD FINAL. WE WERE AT 5000 FT MSL, HDG 180 DEGS, WITH AUTOPLT COUPLED UP TO ILS RWY 9R. DUE TO THE HVY WIND, WE WERE GIVEN A VECTOR OF 150 DEGS TO JOIN THE LOC, CLRED FOR THE APCH. THE AUTOPLT QUICKLY CAPTURED THE LOC AND MADE A HARD TURN TO THE L TO KEEP CTRED. COUPLED WITH THE STRONG WIND, WE BLEW THROUGH THE LOC TO THE N. THE AUTOPLT STRUGGLED BUT CORRECTED BACK. JUST PRIOR TO RE-CENTERING, WE CAPTURED THE GS AND BEGAN A SLOW DSCNT TO THE OM. AFTER JUST PASSING 3500 FT MSL, WE EXPERIENCED A HUGE DSCNT AND DEGRADING PERFORMANCE FOLLOWED BY A WINDSHEAR WARNING AND, SECONDS LATER, A GPWS WARNING. WE IMMEDIATELY BEGAN A GAR ON THE FIRST WARNING, BUT DID NOT ARREST THE DSCNT UNTIL 1000 FT LOW. TWR IMMEDIATELY RPTED OUR 'LOW ALT' WARNING, FOLLOWED BY A LLWAS ALERT THEN BY A 'MICROBURST' ALERT. TOTAL TIME FROM ONSET TO RECOVERY WAS 15 SECONDS MAX. OUR GAR TOOK US OUT TO THE S (180 DEG HDG) THEN OUT TO THE W (270 DEG HDG). ALT CTL WAS IMPOSSIBLE FOR THE NEXT 5+ MINS -- +/-200 FT UNTIL WE CLBED TO 5000 FT MSL. 20 MINS LATER, EVERYTHING SETTLED OUT.

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.