Narrative:

Cleared ILS runway 10, winds 270 degrees at 22 KTS gusting to 30 KTS. Declined. Vectored ILS runway 28. Moderate turbulence on downwind. Cleared ILS runway 28, approximately 4-5 mi outside marker, gear down flaps 15 degrees, speed 160 KTS, autoplt engaged, localizer and GS captured. Without warning, throttles came to idle as speed rapidly increased to 200 KTS. Disconnected autoplt, initiated climb. Speed reached 215 KTS. Decision to go around. Gear up, then speed rapidly decayed to 160 KTS, applied full power. Encountered severe turbulence during go around. Flight director giving confusing commands, later realized toga pressed above 2000 ft, so no go around mode. Difficulty maintaining assigned altitude of 3000 ft. Issued climb to 4000 ft. First officer CRM commentary excellent, and very helpful. Windshear training in sim also allowed early recognition of problem. After our go around, ATC reported microburst at the airport. I suspect we encountered it on final. Vectored to hold at hrv, near airport. After several successful approachs by other aircraft, we were cleared ILS runway 28 again, and landed uneventfully. Maintenance informed of flap overspd and severe turbulence. Discussion with dispatcher after landing revealed he did not suspect severe WX. Several other aircraft went around, and a few diverted. First officer clear commentary was superior, and extremely helpful throughout.

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Original NASA ASRS Text

Title: FLC EXPERIENCES SEVERE TURB FROM A MICROBURST ON APCH. FLC WENT MISSED AND RETURNED FOR LNDG, BUT HAD A FLAP OVERSPD.

Narrative: CLRED ILS RWY 10, WINDS 270 DEGS AT 22 KTS GUSTING TO 30 KTS. DECLINED. VECTORED ILS RWY 28. MODERATE TURB ON DOWNWIND. CLRED ILS RWY 28, APPROX 4-5 MI OUTSIDE MARKER, GEAR DOWN FLAPS 15 DEGS, SPD 160 KTS, AUTOPLT ENGAGED, LOC AND GS CAPTURED. WITHOUT WARNING, THROTTLES CAME TO IDLE AS SPD RAPIDLY INCREASED TO 200 KTS. DISCONNECTED AUTOPLT, INITIATED CLB. SPD REACHED 215 KTS. DECISION TO GO AROUND. GEAR UP, THEN SPD RAPIDLY DECAYED TO 160 KTS, APPLIED FULL PWR. ENCOUNTERED SEVERE TURB DURING GAR. FLT DIRECTOR GIVING CONFUSING COMMANDS, LATER REALIZED TOGA PRESSED ABOVE 2000 FT, SO NO GAR MODE. DIFFICULTY MAINTAINING ASSIGNED ALT OF 3000 FT. ISSUED CLB TO 4000 FT. FO CRM COMMENTARY EXCELLENT, AND VERY HELPFUL. WINDSHEAR TRAINING IN SIM ALSO ALLOWED EARLY RECOGNITION OF PROB. AFTER OUR GAR, ATC RPTED MICROBURST AT THE ARPT. I SUSPECT WE ENCOUNTERED IT ON FINAL. VECTORED TO HOLD AT HRV, NEAR ARPT. AFTER SEVERAL SUCCESSFUL APCHS BY OTHER ACFT, WE WERE CLRED ILS RWY 28 AGAIN, AND LANDED UNEVENTFULLY. MAINT INFORMED OF FLAP OVERSPD AND SEVERE TURB. DISCUSSION WITH DISPATCHER AFTER LNDG REVEALED HE DID NOT SUSPECT SEVERE WX. SEVERAL OTHER ACFT WENT AROUND, AND A FEW DIVERTED. FO CLR COMMENTARY WAS SUPERIOR, AND EXTREMELY HELPFUL THROUGHOUT.

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.