STUDENT PLT OF THIRD SOLO FLT LOST CTL OF THE ACFT ON THE LNDG ROLL AND ENDED UP OFF THE SIDE OF THE RWY IN A SNOW BANK. THE ACFT RECEIVED DAMAGE TO THE WHEELS; PROP AND WINGTIP.

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I HAD A STUDENT PLT ON HIS THIRD SOLO SUPERVISED SOLO WHEN HER AN THE AIRPLANE OFF THE SIDE OF RWY 2 AT DAYTON GENERAL ARPT (MGY). WE MADE 3 TKOFS AND LNDGS IN A 5-7 KT XWIND. I DECIDED HE WAS ABLE TO SOLO IN THESE CONDITIONS SAFELY. THE 3 LNDGS WERE ON CTRLINE AND SMOOTH AT TOUCHDOWN. THE ROLLOUTS WERE ALL ON CTRLINE. UPON THE SECOND SOLO LNDG; I (INSTRUCTOR) OBSERVED THE AIRPLANE TOUCH DOWN; BALLOON; AND THEN TOUCH DOWN A SECOND TIME WITH THE AIRPLANE FACING SIDEWAYS APPROX 20-30 DEGS L OF CTR. THE AIRPLANE SIDE-LOADED AND LANDED L OFF THE RWY. BOTH MAIN GEAR TIRES ON THE CESSNA 172 WERE LOCKED AND SKIDDING. AS THE AIRPLANE LEFT THE RWY; IT STRUCK A 2 FT SNOW BANK AND THEN SUNK INTO THE MUD WITH THE NOSEWHEEL. THE ACFT NOSED OVER AND THEN STRUCK THE PROP. THE ACFT THEN FELL TO ITS SIDE STRIKING THE R WING. THE AIRPLANE WAS THEN REMOVED FROM THE RWY SO OTHER LARGER ACFT COULD LAND SAFELY. I BELIEVE STUDENT HAD TENSED UP APPLYING FULL BRAKES. THE ACFT WAS THEN UNABLE TO BE REALIGNED WITH THE RWY. I ALSO BELIEVE STUDENT DID NOT APPLY SUFFICIENT R RUDDER TO BRING THE ACFT STRAIGHT DOWN CTRLINE. HE SEEMED TO FEEL THAT IF TOO MUCH RUDDER WAS APPLIED; THE ACFT MAY HAVE TIPPED OVER. HE THEN FELT THE SAFEST ACTION WAS TO LET THE ACFT ROLL INTO THE SNOW BANK.