Narrative:

Encountered severe turbulence and 80 KT windshear (plus 80 KTS) on downwind at dca at 5000 ft. Caused altitude deviation of approximately 1000 ft, aircraft basically uncontrollable. Contacted approach and were told to do 'whatever we needed to do,' rapidly moving cold front moving through area at this time but no warnings for turbulence. Airport closed shortly afterward for windshear and turbulence. Better WX information would have possibly prevented this from occurring.

Google
 

Original NASA ASRS Text

Title: FLC LOST 1000 FT IN SEVERE WINDSHEAR TURB.

Narrative: ENCOUNTERED SEVERE TURB AND 80 KT WINDSHEAR (PLUS 80 KTS) ON DOWNWIND AT DCA AT 5000 FT. CAUSED ALTDEV OF APPROX 1000 FT, ACFT BASICALLY UNCONTROLLABLE. CONTACTED APCH AND WERE TOLD TO DO 'WHATEVER WE NEEDED TO DO,' RAPIDLY MOVING COLD FRONT MOVING THROUGH AREA AT THIS TIME BUT NO WARNINGS FOR TURB. ARPT CLOSED SHORTLY AFTERWARD FOR WINDSHEAR AND TURB. BETTER WX INFO WOULD HAVE POSSIBLY PREVENTED THIS FROM OCCURRING.

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.