Sikorsky Aircraft Corp., Stratford, Conn., is being awarded a $15,450,047 modification against a previously awarded cost-plus-incentive-fee contract (N00019-06-C-0081) for a fleet common operating environment condition based maintenance plus software toolset in support of the CH-53K helicopter program.  In addition, this modification includes installation, operation, and recurring data analysis utilizing the basic and advanced capabilities within the system.  No funds will be obligated at the time of award.  Work will be performed in Lexington Park, Md. (90 percent), and Stratford, Conn. (10 percent), and is expected to be completed in February 2018.  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.