LOSS OF DIRECTIONAL CTL ON LNDG DUE TO GUST OF XWIND BEYOND ACFT CAPABILITY.

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ON MAY/XX/95 AT APPROX XA08 PM; I WAS LNDG A SENECA II AT HYA AFTER FLYING FROM GMU; SC. CONDITIONS WERE VFR IN DAYLIGHT. WHILE IN LNDG FLAIR ON RWY 33; AN ESTIMATED 30 PLUS KT XWIND PUSHED FROM R TO L. (ACFT HAD XWIND MAX OF 17 KTS.) I CORRECTED TO FULL CTL MOVEMENT (AILERON INTO THE WIND AND APPLY OPPOSITE RUDDER). XWIND WAS GREATER THAN AIRPLANE COULD HANDLE. WXVANED INTO WIND AND SET DOWN ON L SIDE OF RWY 33 ON A HDG OF 360 DEGS. ACFT CROSSED 150 FT WIDE AND STRUCK RWY LIGHT ON R SIDE OF RWY 33. FINISHED LNDG ROLLOUT IN GRASS AREA ADJACENT TO R OF RWY 33. PROP WAS CUT ON LEADING EDGE OF 1 BLADE; UNDERSIDE OF WING ON L SIDE WAS CUT APPROX 10 INCHES. FUEL TANK WAS RUPTURED. WITHIN 10 MINS; TWR CHANGED ACTIVE TO RWY 6. TO PREVENT A RECURRENCE; HYA TWR CALLED WINDS AT 15 KTS AT 330 DEGS. NO MENTION OF GUSTS. WIND WAS CONSTANT 20 PLUS KTS WITH CONSTANT GUST OF 30 PLUS KTS; WITH WIND SHIFTING FROM 330 DEGS TO 060 DEGS. NEED MORE ACCURATE INFO FROM TWR. I DON'T BELIEVE ACCIDENT COULD HAVE BEEN PREVENTED AS THE 30 PLUS KT XWIND STRUCK DURING WEAK PART OF LNDG; DURING FLAIR WITH NO PWR ON AND FULL FLAPS. I BELIEVE I DID THE BEST UNDER THE CIRCUMSTANCES AND AM GRATEFUL I WALKED AWAY WITH NO INJURY TO MYSELF OR MY PAX. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE FAA INVESTIGATED THE INCIDENT AND REQURIED THE PLT TO TAKE A CHK FLT WITH AN FAA INSPECTOR. CHK RIDE INCLUDED SINGLE ENG; XWIND LNDGS. PLT'S LICENSE WAS REINSTALLED. WX DURING THE MISHAP WAS MODERATE TURB BTWN 8000 FT AND 12000 FT WITH SHIFTING; GUSTY WINDS. THOUGH THE TWR RPTED STEADY WIND DOWN THE RWY; THE RPTR SAW WIND SOCK VARYING GREATLY; BOTH IN DIRECTION AND SPD. SINCE THE UNEXPECTED XWIND WAS BEYOND THE CAPABILITY OF THE ACFT; THE FAA INSPECTOR SAID THERE WAS NO MUCH THE PLT COULD DO.