Narrative:

On 15 mi final, we heard numerous aircraft and tower reports of +/-20 KT airspace fluctuations by other aircraft on approach. The aircraft ahead of us initially began a missed approach and then saw the airport and continued on in to land. We were on a 3 mi final and cleared to land when we received an 'increasing performance' windshear alert by our onboard windshear avoidance guidance system unit. We executed a go around, and in so doing, while following our onboard windshear avoidance guidance system guidance, we overflew the missed approach altitude (2800 ft MSL) and eventually leveled off at 3800 ft MSL before the onboard windshear avoidance guidance system guidance disappeared and we were assured of having exited the windshear event. We called the missed approach and was told to level at 4000 ft MSL and turn left heading 180 degrees for a vector back for another approach. We eventually landed in VMC conditions on the next pass, though we had to ignore multiple increased and decreased performance windshear alerts to do so, since there was no other airport which was less windy within range of our limited fuel supply. We reported +/-20 KT airspeed fluctuations on final to the tower.

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Original NASA ASRS Text

Title: MLG ACFT ON APCH IN MARGINAL WX CONDITIONS ENCOUNTERED WINDSHEAR AND FLC EXECUTED A MISSED APCH. DURING THE MISSED APCH THE FLC WAS FOLLOWING THEIR WINDSHEAR AVOIDANCE GUIDANCE SYS AND OVERSHOT THE MISSED APCH ALT BY 1000 FT. ATC CLRED THEM TO LEVEL AT 4000 FT.

Narrative: ON 15 MI FINAL, WE HEARD NUMEROUS ACFT AND TWR RPTS OF +/-20 KT AIRSPACE FLUCTUATIONS BY OTHER ACFT ON APCH. THE ACFT AHEAD OF US INITIALLY BEGAN A MISSED APCH AND THEN SAW THE ARPT AND CONTINUED ON IN TO LAND. WE WERE ON A 3 MI FINAL AND CLRED TO LAND WHEN WE RECEIVED AN 'INCREASING PERFORMANCE' WINDSHEAR ALERT BY OUR ONBOARD WINDSHEAR AVOIDANCE GUIDANCE SYS UNIT. WE EXECUTED A GAR, AND IN SO DOING, WHILE FOLLOWING OUR ONBOARD WINDSHEAR AVOIDANCE GUIDANCE SYS GUIDANCE, WE OVERFLEW THE MISSED APCH ALT (2800 FT MSL) AND EVENTUALLY LEVELED OFF AT 3800 FT MSL BEFORE THE ONBOARD WINDSHEAR AVOIDANCE GUIDANCE SYS GUIDANCE DISAPPEARED AND WE WERE ASSURED OF HAVING EXITED THE WINDSHEAR EVENT. WE CALLED THE MISSED APCH AND WAS TOLD TO LEVEL AT 4000 FT MSL AND TURN L HDG 180 DEGS FOR A VECTOR BACK FOR ANOTHER APCH. WE EVENTUALLY LANDED IN VMC CONDITIONS ON THE NEXT PASS, THOUGH WE HAD TO IGNORE MULTIPLE INCREASED AND DECREASED PERFORMANCE WINDSHEAR ALERTS TO DO SO, SINCE THERE WAS NO OTHER ARPT WHICH WAS LESS WINDY WITHIN RANGE OF OUR LIMITED FUEL SUPPLY. WE RPTED +/-20 KT AIRSPD FLUCTUATIONS ON FINAL TO THE TWR.

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.