TWIN CESSNA EXECUTES GAR AFTER PA28 PLT RPTS HE IS ON SHORT FINAL. DURING LANDING HE WAS INVOLVED IN A RWY EXCURSION; WITH DAMAGE; CAUSED BY GAR WAKE TURB.

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THIS INCIDENT BEGAN WHEN I WAS 12 MI E AT 4000 FT; INBOUND FOR LNDG AT PARKERSBURG; WV. I WAS IN SIGHT OF MY CALL POINT; WHICH WAS ST MARY'S. I HEARD ANOTHER ACFT MAKE ITS CALL TO PARKERSBURG TWR STATING THAT HE WAS 20 MI E; ALT UNKNOWN; INBOUND FOR LNDG. THE TWR RESPONDED BY SAYING THAT HE NEEDS TO RPT A 3 MI FINAL FOR RWY 28. I KNEW THAT HE WAS BEHIND ME THEN AND THEREFORE I MADE MY CALL TO THE TWR STATING THAT I WAS 12 MI E; 4000 FT INBOUND FOR LNDG. THE TWR RESPONDED FOR ME TO RPT A 3 MI FINAL FOR RWY 28. A MIN OR TWO PASSED AND I HEARD; 'I HAVE THE TFC IN SIGHT; I'M GOING TO DO A 180 DEG TURN AND LET THE TFC IN.' I KNEW HE MEANT THAT HE WAS GOING TO DO A 360 DEG TURN AND COME IN BEHIND ME. I ALSO KNEW HE COULD SEE ME IN FRONT OF HIMSELF. I HAD THE ARPT IN SIGHT AND CONTINUED MY DSCNT. I THEN RPTED PARKERSBURG TWR THAT I WAS ON 3 MI FINAL FOR RWY 28. THE TWR CLRED ME TO LAND RWY 28. I APPLIED MY FIRST NOTCH OF FLAPS AND CONTINUED MY DSCNT. I THEN APPLIED SECOND FLAPS AND AS I REACHED DOWN FOR THE FLAP LEVER; I GOT A GLIMPSE OF AN ACFT ABOVE ME. I DID A DOUBLE TAKE AND AS I DID; HE PASSED ME -- LNDG GEAR DOWN -- THEN HE SAID; 'TWR; WHERE IS THE CHEROKEE; I DON'T SEE HIM?' THE TWR SAID 'WE DON'T SEE HIM EITHER; BUT HE IS ON FINAL FOR RWY 28 NOW.' I SPOKE UP AND SAID THAT 'I CAN SEE THE TFC; DO YOU WANT ME TO DO A GAR; I'M RIGHT HERE OFF THE END OF RWY 28?' A PAUSE; THEN THE CESSNA SAID; 'NO; I'LL DO A GAR.' I WATCHED HIM PWR UP AND START HIS GAR WHILE I WAS 3 NOTCHES AND PREPARING TO LAND. THERE WAS NO WIND; BUT ON CLRING THE THRESHOLD; I NOTICED SOME TURB I WASN'T EXPECTING. I FLARED FOR TOUCHDOWN AND AS THE WHEELS TOUCHED THE RWY; A SUDDEN LIFT HIT MY L WING HARD ENOUGH TO LIFT THE WING AND LNDG GEAR OFF THE GND. I SLAMMED THE R RUDDER TO THE FLOOR; THE R WINGTIP HIT THE RWY AND I SKIDDED OFF TO THE L OF THE RWY INTO THE GRASS. THE TWR CALLED AND ASKED IF I WAS OK. I WAS; AND THEY SENT HELP. AT THE TIME OF THE INCIDENT; I WASN'T AWARE OF WHAT TOOK PLACE; BUT AFTER DISCUSSING THE FACTS WITH MY INSTRUCTOR; I THEN UNDERSTOOD THAT MOST LIKELY I FLEW INTO AN UPDRAFT CAUSED BY THE PROP BLAST OF THE CESSNA DOING HIS GAR. ALSO; EVEN THOUGH I FELT THAT I PANICKED BY STANDING ON R RUDDER; MY INSTRUCTOR FEELS IT WAS THE ONLY THING THAT KEPT THE PLANE FROM FLIPPING ON ITS TOP. WHAT I DID MIGHT HAVE SAVED THE ACFT FROM MORE SEVERE DAMAGE. WHAT I'VE LEARNED HERE IS: DON'T ALWAYS TRUST THAT THE TWR IS GOING TO BE ABLE TO GIVE SEPARATION. THEY AREN'T IN CTL OF THE PLTS THAT ARE IN THE PATTERN WHEN YOU ARE. ALL I KNOW NOW IS; I'M THE ONLY ONE WHO DIDN'T DO ANYTHING WRONG HERE AND I'M THE ONLY ONE WHO SUFFERED. I'M GOING TO MARK IT UP AS A LESSON LEARNED; AND PUT THE SCAR ON THE OUTSIDE.