Narrative:

On approach into den, there were reports of virga and LLWS. Many scattered rain showers on the radar. Den was changing runways frequently as the wind shifted. We briefed about windshear and went over the recovery procedure. Only some very light turbulence during the approach, but the flight attendants had been seated early. On the downwind vector for runway 26, we noticed a heavy shower inside the marker. On base leg it seemed like it had moved closer to the field, but had gotten stronger. Aircraft were still landing through it, but we discussed that we would most likely break off the approach. On final after intercepting the GS, we were in the clear just inside fuzzz, airspeed 170 KTS, flaps 20 degrees when the nose pitched over as the autoplt tried to follow the GS and the speed started to rapidly increase. We immediately executed the windshear profile and ended up climbing to 12000 ft in the updraft. Reported the incident immediately to ATC and dispatch as soon as able. Exceeded the flap speeds during the recovery, mainly during the initial big increase, by about 10 KTS, and made a logbook entry. My first officer was a big help with callouts and checklists as we dealt with the shear and subsequent landing on runway 35L.

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Original NASA ASRS Text

Title: B767 FLC MADE A MISSED APCH DUE TO BEING UNABLE TO MAINTAIN SPD AND GS DSCNT PROFILE DURING AN ILS APCH AT DEN.

Narrative: ON APCH INTO DEN, THERE WERE RPTS OF VIRGA AND LLWS. MANY SCATTERED RAIN SHOWERS ON THE RADAR. DEN WAS CHANGING RWYS FREQUENTLY AS THE WIND SHIFTED. WE BRIEFED ABOUT WINDSHEAR AND WENT OVER THE RECOVERY PROC. ONLY SOME VERY LIGHT TURB DURING THE APCH, BUT THE FLT ATTENDANTS HAD BEEN SEATED EARLY. ON THE DOWNWIND VECTOR FOR RWY 26, WE NOTICED A HVY SHOWER INSIDE THE MARKER. ON BASE LEG IT SEEMED LIKE IT HAD MOVED CLOSER TO THE FIELD, BUT HAD GOTTEN STRONGER. ACFT WERE STILL LNDG THROUGH IT, BUT WE DISCUSSED THAT WE WOULD MOST LIKELY BREAK OFF THE APCH. ON FINAL AFTER INTERCEPTING THE GS, WE WERE IN THE CLR JUST INSIDE FUZZZ, AIRSPD 170 KTS, FLAPS 20 DEGS WHEN THE NOSE PITCHED OVER AS THE AUTOPLT TRIED TO FOLLOW THE GS AND THE SPD STARTED TO RAPIDLY INCREASE. WE IMMEDIATELY EXECUTED THE WINDSHEAR PROFILE AND ENDED UP CLBING TO 12000 FT IN THE UPDRAFT. RPTED THE INCIDENT IMMEDIATELY TO ATC AND DISPATCH AS SOON AS ABLE. EXCEEDED THE FLAP SPDS DURING THE RECOVERY, MAINLY DURING THE INITIAL BIG INCREASE, BY ABOUT 10 KTS, AND MADE A LOGBOOK ENTRY. MY FO WAS A BIG HELP WITH CALLOUTS AND CHKLISTS AS WE DEALT WITH THE SHEAR AND SUBSEQUENT LNDG ON RWY 35L.

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.