T.I. has 11 days to get his story in order -- because on October 15, he has to go before a federal judge to plead his case not to have his probation revoked.


T.I. was busted last month on felony possession of a controlled substance -- and he just happens to be on probation for a 2009 federal gun possession conviction.

So on October 15, T.I. will go before a judge and hope his probation isn't revoked.

Best of luck.