hardrock sport07' + 3 ft cement drop=doomed or YAY DROP?

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how high a jump do you guys think would it take to start ruining the parts of a specialized hardrock sport disc 07'? becuase i just "cruize" near a house and "use" the 3ft drop that they didnt make a fence yet... i didnt use it without their approvial, i just "used" it and made scar marks on my right leg becuase of the metal... er.... ow.... but can my bike do a 3 ft drop? (i aways try to land on my rear first... thx.. tell me before i do this the 23rd time i made it and the 1rd i fell.....(PS: dont tell my "friends":) )