Sikorsky Aircraft Corp., Stratford, Conn., was awarded a $42,019,356 firm-fixed-price contract.  The award will provide for the upgrade and overhaul services of the main rotor blade. Work will be performed in Shelton, Conn., with an estimated completion date of Sept. 28, 2015.  The bid was solicited through the Internet, with one bid received.  The U.S. Army Contracting Command, Redstone Arsenal, Ala., is the contracting activity (W58RGZ-12-D-0212)