Rolls-Royce Corp., Indianapolis, Ind., is being awarded a $15,634,738 modification to a previously awarded firm-fixed-price contract (N00019-10-C-0020) to exercise an option for maintenance services in support of the V-22 AE1107C turboshaft engines.  Work will be performed in Oakland, Calif. (70 percent), and Indianapolis, Ind. (30 percent), and is expected to be completed in November 2012.  Contract funds in the amount of $15,634,738 will expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md., is the contracting activity.