Rolls-Royce Corp., Indianapolis, Ind., is being awarded a $34,228,615 modification to a previously awarded firm-fixed-price contract (N00019-10-C-0020) for maintenance services in support of the MV-22 AE1107C turboshaft engine.  Work will be performed in Oakland, Calif. (70 percent), and Indianapolis, Ind. (30 percent), and is expected to be completed in September 2012.  Contract funds in the amount of $34,228,615 will expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md., is the contracting activity.