MULTI-ENG TRAINEE FLARES HIGH; DURING THE SECOND LNDG IN A C310; CAUSING THE ACCOMPANYING FLT INSTRUCTOR TO TAKE ACFT CTLS FOR RECOVER. IN SPITE OF INSTRUCTOR'S EFFORTS; THE ACFT LNDG HARD BREAKING OFF THE L LNDG GEAR AND SKIDDING OFF THE SIDE OF THE RWY.

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I WAS ON A SECOND TRAINING FLT TO GAIN EXPERIENCE AND EVENTUALLY GET CHKED OUT IN A C310. I WAS IN THE L SEAT WHEN WE DEPARTED MORRIS (C09) ARPT TO FLY TO HARRISON (HRO). WE DEPARTED APPROX XY30 CST; AND EXPECTED TO LAND AT HARRISON APPROX YZ00 CST. AS WE APCHED HARRISON; THE INSTRUCTOR GUIDED ME THROUGH THE PROCS FOR LNDG. WE SET PWR; FLAPS AND GEAR AND WE WERE SET UP TO LAND ON RWY 18. AS I FLARED THE INSTRUCTOR SAID THAT WE WERE FLARING TOO HIGH. I ADDED PWR AND HE TOOK THE CTL WHEEL AND PUSHED THE NOSE DOWN. THE RESULTING HARD LNDG CAUSED THE L GEAR TO COLLAPSE; WE THEN SKIDDED OFF THE RWY TO THE L INTO THE GRASS. NEITHER ONE OF US WAS INJURED AND WE EXAMINED THE ACFT FOR DAMAGE AND THE POSSIBILITY OF A FUEL LEAK. NO FUEL LEAK EXISTED. WE THEN PICKED UP SOME DEBRIS OFF THE RWY TO PREVENT OTHER ACFT FROM LNDG UPON IT. THIS WAS MY SECOND FLT IN THE C310; AND MY SECOND LNDG ATTEMPT. ALTHOUGH I INITIATED THE FLARE EARLY; I FELT THE FLT INSTRUCTOR SHOULD HAVE BEEN MORE ATTENTIVE AND RESPONDED IN TIME TO CORRECT THE SIT. I JUST RECEIVED MY MULTI-ENG RATING; SEPTEMBER 1998 AND HAVE APPROX 23 HRS MULTI-TIME; 4 HRS IN C310'S WITH 2 LNDGS. THE INSTRUCTOR HAS APPROX 2800 HRS TOTAL TIME; 800 HRS IN C310'S AND IS A CFI/MEI. MY BELIEF THAT THE INSTRUCTOR WAS PREPARED AND ALERT TO POSSIBLE LNDG TECHNIQUE; AND THAT HE KNEW MY EXTREME LACK OF EXPERIENCE IN THIS ACFT TYPE; SHOULD HAVE BEEN ENOUGH TO WARRANT DUE CAUTION AT A CRITICAL PHASE OF FLT.