General Electric Engine Services, Inc., Cincinnati, Ohio, is being awarded a $13,783,020 modification to a previously awarded firm-fixed-price, indefinite-delivery/indefinite-quantity contract (N00421-09-D-0008) for the repair of 15 T700-GE-401 engines and 36 T700-GE-401C engines for the AH-1Z and UH-1Y H-1 helicopters.  Work will be performed in Winfield, Kan., and is expected to be completed in February 2012.  Contract funds in the amount of $4,349,904 will expire at the end of the current fiscal year.  The Naval Air Warfare Center Aircraft Division, Patuxent River, Md., is the contracting activity.