Sikorsky Aircraft Corp., Stratford, Conn., was issued a modification on contract SPM4AX-12-D-9402/P00029.  The award is a firm fixed price, sole source contract with a maximum $11,404,048 for aircraft platform spare parts.  There are no other locations of performance.  Using military services are Army, Navy, Air Force, and Marine Corps.  There was one solicitation with one response.  Type of appropriation is fiscal 2013 Defense Working Capital Funds.  The date of performance completion is Dec. 31, 2012.  The contracting activity is the Defense Logistics Agency Aviation, Richmond, Va.