Narrative:

June 1990 flight. Experienced a windshear encounter (possible microburst) at 2000' MSL and could not recover until 1000' MSL. After bucks, we were vectored for a downwind for the ILS 27R approach descending to 6000' MSL and slowed to 210 KTS and then to 190 KTS. Scattered thunderstorms were visually observed and a small line of thunderstorms were painted on the radar as depicted on the sketch. We refused a vector for a left turn to a right downwind because it would have put us into the WX and the ride was already moderate turbulence. Other aircraft in our area had requested lower altitude and were not complaining about WX or the ride. We requested lower but could not get it due to aircraft below us. Established on the localizer at 3000' MSL and 210 KTS. We selected flaps 5 and began to slow and configure. In the previous 10 mins the altimeter setting had dropped from 29.79 to 29.74 and the wind had shifted from 2115 to 3620 to 2810 to calm when we were on final. On final we were VMC but could see an area of what appeared to be light rain between us and the airport but was not really painting on radar. On the approach and passing the LOM we were configured at flaps 40 and stabilized at vref plus 15. Just prior to reaching 2000' MSL, the airspeed began to bleed off to vref plus 2 and I increased thrust. The vertical speed increased from 500 FPM to 2000 FPM. The airspeed remained constant at vref plus 2. At this point I also had a computer flag in my ADI, all the bow-tie comparator lights were lit and the GPWS was screaming at me. The sink was arrest at 1000' MSL, just about the time we flew out of the rain. A quick observation of the WX surrounding the airport dictated not going around. We re-intercepted the G/south and made a normal landing.

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Original NASA ASRS Text

Title: ACR MLG ENCOUNTERS MICRO-BURST AT 2000' ON ILS APCH TO RWY 27R AT PHL.

Narrative: JUNE 1990 FLT. EXPERIENCED A WINDSHEAR ENCOUNTER (POSSIBLE MICROBURST) AT 2000' MSL AND COULD NOT RECOVER UNTIL 1000' MSL. AFTER BUCKS, WE WERE VECTORED FOR A DOWNWIND FOR THE ILS 27R APCH DSNDING TO 6000' MSL AND SLOWED TO 210 KTS AND THEN TO 190 KTS. SCATTERED TSTMS WERE VISUALLY OBSERVED AND A SMALL LINE OF TSTMS WERE PAINTED ON THE RADAR AS DEPICTED ON THE SKETCH. WE REFUSED A VECTOR FOR A L TURN TO A R DOWNWIND BECAUSE IT WOULD HAVE PUT US INTO THE WX AND THE RIDE WAS ALREADY MODERATE TURB. OTHER ACFT IN OUR AREA HAD REQUESTED LOWER ALT AND WERE NOT COMPLAINING ABOUT WX OR THE RIDE. WE REQUESTED LOWER BUT COULD NOT GET IT DUE TO ACFT BELOW US. ESTABLISHED ON THE LOC AT 3000' MSL AND 210 KTS. WE SELECTED FLAPS 5 AND BEGAN TO SLOW AND CONFIGURE. IN THE PREVIOUS 10 MINS THE ALTIMETER SETTING HAD DROPPED FROM 29.79 TO 29.74 AND THE WIND HAD SHIFTED FROM 2115 TO 3620 TO 2810 TO CALM WHEN WE WERE ON FINAL. ON FINAL WE WERE VMC BUT COULD SEE AN AREA OF WHAT APPEARED TO BE LIGHT RAIN BTWN US AND THE ARPT BUT WAS NOT REALLY PAINTING ON RADAR. ON THE APCH AND PASSING THE LOM WE WERE CONFIGURED AT FLAPS 40 AND STABILIZED AT VREF PLUS 15. JUST PRIOR TO REACHING 2000' MSL, THE AIRSPD BEGAN TO BLEED OFF TO VREF PLUS 2 AND I INCREASED THRUST. THE VERT SPD INCREASED FROM 500 FPM TO 2000 FPM. THE AIRSPD REMAINED CONSTANT AT VREF PLUS 2. AT THIS POINT I ALSO HAD A COMPUTER FLAG IN MY ADI, ALL THE BOW-TIE COMPARATOR LIGHTS WERE LIT AND THE GPWS WAS SCREAMING AT ME. THE SINK WAS ARREST AT 1000' MSL, JUST ABOUT THE TIME WE FLEW OUT OF THE RAIN. A QUICK OBSERVATION OF THE WX SURROUNDING THE ARPT DICTATED NOT GOING AROUND. WE RE-INTERCEPTED THE G/S AND MADE A NORMAL LNDG.

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.