AN S80 FLC EXPERIENCES LOW LEVEL WINDSHEAR WARNING DURING TKOF AT 1000 FT AGL AT ORD. THE ESCAPE MANEUVER OVERBOOSTED THE ENGS SO THE FLT RETURNS TO ORD AS EMER TFC.

Narrative

DEPARTING ORD RWY 32L FROM INTXN T10 WE RECEIVED A RED WINDSHEAR LIGHT AND AN AUDIBLE WINDSHEAR WARNING PASSING THROUGH APPROX 1000 FT AGL. THE CAPT DISCONNECTED THE AUTOTHROTTLES AND ADVANCED THE THROTTLES TO MAX PWR. I NOTED EGT ON BOTH ENGS WAS ABOVE 650 DEGS AND EPR AT 2.24 AND 2.26. HE PULLED THE NOSE UP TO ABOUT 15 DEGS PITCH UP. WITHIN A FEW HUNDRED FT AND 10-15 SECONDS; THE WARNING ENDED. THE CAPT THEN REDUCED PITCH AND PWR TO NORMAL LEVELS. I TOLD THE CAPT WE HAD OVERBOOSTED THE ENGS. WE AGREED THAT AN AIR ABORT BACK TO ORD WAS IN ORDER. WE CONTINUED THE CLB TO 5000 FT MSL WHILE CLEANING UP THE FLAPS AND SLATS. I NOTIFIED ORD TWR OF THE WINDSHEAR AND OUR INTENTION TO RETURN TO ORD. TWR SENT US TO DEP CTL WHERE WE DECLARED AN EMER FOR THE ENG CONDITION AND THE IMPENDING OVERWT LNDG 136000 LBS. I PASSED EMER DATA AND A REQUEST FOR VECTORS RWY 9R ILS. ON VECTORS WITH THE ACFT STABLE WE TURNED TO THE FLT MANUAL TO REVIEW ENG OVERSPD/OVERTEMP AND OVERWT LNDG PROCS. THE CAPT MADE AN UNEVENTFUL OVERWT LNDG. TOTAL FLT TIME 14 MINS. PREDEP ATIS INDICATED MODERATE PRECIP; NNW; 8 NM. WX RADAR SHOWED A FEW AREAS OF RED RETURNS BUT NOT ALONG OUR IMMEDIATE FLT PATH. THE WINDSHEAR WARNING WAS NOT ACCOMPANIED BY ANY IMMEDIATE CHANGES IN AIRSPD OR VERT VELOCITY. THE WINDSHEAR LIGHT AND AUDIBLE WARNING WHILE STILL IN TKOF CONFIGN AND AT ONLY 1000 FT AGL WERE SUFFICIENT CONDITIONS TO WARRANT A RED BOX ESCAPE MANEUVER. ACFT SYS REACTED IN ACCORDANCE WITH THE FLT MANUAL. SUPPLEMENTAL INFO FROM ACN 401841: WX AT ORD WAS APPROX 600 FT; 2 DME WITH SLIGHT TAILWIND FOR RWY 32L T10 INTXN. AREAS OF MODERATE SHOWERS WERE RPTED WITHIN 10 MI OF THE ARPT TO THE W AND NW. CAPT WAS PF. NOTIFIED THE FLT ATTENDANTS FIRST THEN PAX OF OUR NEED TO RETURN. LNDG WAS UNEVENTFUL. FO DID AN EXCELLENT JOB.