Rolls-Royce Corp., Indianapolis, Ind., is being awarded a $48,981,414 modification to a previously awarded firm-fixed-price contract (N00019-07-C-0060) for the procurement of 24 AE1107C engines for the Air Force CV-22 aircraft (14 spares and 10 Lot 15 installs).  Work will be performed in Oakland, Calif. (70 percent), and Indianapolis, Ind. (30 percent), and is expected to be completed in April 2012.  Contract funds will not expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md., is the contracting activity.