POSSIBLE OVERTEMP OF ENGS DURING A HARD LNDG AND RESULTING GAR IS EXPERIENCED BY THE FLC OF A LNDG MD88 ON RWY 4 AT LEX; KY.

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THE INCIDENT INVOLVES A HARD LNDG FOLLOWED BY A GAR; VISUAL PATTERN BACK AROUND TO A FULL STOP LNDG. IT WAS STILL DAYLIGHT. THE CAPT BRIEFED THE ILS RWY 4 AND WAS THE PF. LEX APCH VECTORED US TO JOIN FINAL APPROX 10 NM OUT. VISIBILITY WAS CLR UNDERNEATH AND RWY WAS ACQUIRED AT APPROX 10 NM. APCH WAS UNEVENTFUL. ACFT WAS FULLY CONFIGURED AND ON SPD AT 1000 FT AFE. I NOTED WINDS ON FINAL BTWN 2000 FT AND 1000 FT MSL TO BE 20-30 KTS. NOTHING UNUSUAL OCCURRED UNTIL APPROX 100 FT AFE; WHEN AN INCREASED SINK RATE DEVELOPED. PWR WAS ADVANCED UPON INITIAL INDICATION. VERY RAPID THEREAFTER; WHEN IT WAS APPARENT WE WERE NOT BREAKING THE SINK RATE; TOGA PWR WAS MANUALLY SELECTED. THE ACFT TOUCHED DOWN AND BOUNCED BACK INTO THE AIR. AT THIS POINT TOGA PWR HAD ALREADY BEEN SELECTED. AFTER THROTTLES WERE ADVANCED FOR THE GAR; I RECALLED SEEING A THROTTLE SETTING SLIGHTLY HIGHER THAN GAR EPR SETTING. I DID NOT RECALL SEEING ANY ENG INDICATIONS FLASHING TO INDICATE AN OVER-BOOST. GAR WAS ACCOMPLISHED; TWR WAS NOTIFIED AND CLRED US BACK AROUND FOR A VISUAL APCH TO RWY 4. I SPOKE WITH THE FLT ATTENDANTS AND MADE A PA TO THE PAX. THE CAPT MADE A VISUAL APCH. AT ABOUT THE SAME POINT OVER THE END OF THE RWY; THE ACFT DEVELOPED AN INCREASED SINK RATE; BUT THIS TIME WAS FULLY ARRESTED BY ADDING PWR. LNDG; ROLLOUT AND TAXI TO THE GATE WAS NORMAL. DURING THE TAXI-IN; I NOTIFIED TWR INFORMING THEM OF THE LOSS OF LIFT ON SHORT FINAL BUT NOTED WE DID NOT RECEIVE ANY WINDSHEAR WARNINGS. PARKED AT THE GATE. I PERFORMED A WALKAROUND. I SAW NOTHING ABNORMAL TO INCLUDE THE TAILSKID. THE CAPT COORDINATED WITH THE CHIEF PLT AND DUTY OFFICER. WE WERE CLRED TO CONTINUE WITH THE ROTATION. AN EQUIP SUBSTITUTION WAS MADE FROM AN INBOUND FLT IN ORDER FOR A HARD LNDG INSPECTION TO BE PERFORMED. SUPPLEMENTAL INFO FROM ACN 561478: WIND AT THE AIRFIELD WAS APPROX 7 KTS 30-40 DEGS OFF RWY HEADING. WE WERE FULLY CONFIGURED AND STABLE AT APPROX 1000 FT AGL AND AT 500 FT AGL; AS WELL. WE FLEW A VISUAL PATTERN AND MADE A NORMAL LNDG ON RWY 4; ALTHOUGH A SIMILAR SINK BEGAN TO DEVELOP OVER THE THRESHOLD JUST AS BEFORE. I ANTICIPATED THE SINK; HOWEVER; AND; CARRYING SLIGHTLY MORE SPD THAN ON THE FIRST APCH; WAS ABLE TO ARREST IT WITH APPLICATION OF PWR. THE TAILSKID WAS UNMARKED. I CONTACTED THE DISPATCHER AND MAINT. I RECOMMENDED A HARD LNDG INSPECTION AND MADE THE APPROPRIATE LOGBOOK ENTRY. I SPOKE WITH THE CHIEF PLT'S OFFICE THROUGH THE OCC DUTY PLT.