ATK SPACE SYSTEMS INC.

THE PURPOSE OF THIS MOD 4 IS TO CORRECT THE END DATE, PROVIDE FUNDING, AND REVISE THE PRINCIPAL INVESTIGATOR. SEE PAGE 4 FOR DETAILS. WBS 1.0 ULTRA LIGHTWEIGHT CORE DESIGN GENERATION. THE ATK TEAM SHALL, ON A BEST EFFORTS BASIS, GENERATE AN ENGINEERED COMPOSITE CORE DESIGN THAT HAS A JUSTIFIABLE EXPECTATION OF MEETING THE TARGET CAPABILITIES LISTED IN THE NRA. THE BASIS FOR THE EXPECTATION SHALL BE ROOTED IN ENGINEERING ANALYSES THAT APPLY FIRST PRINCIPLES OF ENGINEERING MECHANICS AND AVAILABLE MATERIALS INFORMATION TO EVALUATE CORE DESIGNS. THESE ANALYSES, INFORMATION, AND RELATED CALCULATIONS SHALL BE DOCUMENTED AND DELIVERED TO NASA. ANY SPREADSHEETS, COMPUTATIONAL TOOLS SOURCE CODE, COMPUTER PROGRAMS SOURCE CODE, CAD MODELS, AND FINITE ELEMENT MODELS DEVELOPED IN WBS 1.0, WITH ANY ATK PROPRIETARY PREEXISTING BACKGROUND INFORMATION, DATA, PROCESSES AND PROCEDURES EITHER REMOVED OR IDENTIFIED, SHALL BE DELIVERED TO NASA IN ELECTRONIC FORMAT SUFFICIENT FOR NASA TO PERFORM SIMILAR CALCULATIONS AND ANALYSES. A FINAL CORE DEFINITION THAT INCLUDES MATERIAL SELECTION, CORE CELL GEOMETRY, AND THE COMPOSITE LAMINATE DEFINITION SHALL BE DOCUMENTED IN A TECHNICAL DRAWING. WBS 2.0 ULTRA LIGHTWEIGHT CORE PRODUCTION DEMONSTRATION. ATK SHALL, ON A BEST EFFORTS BASIS, PROCURE ALL MATERIALS, TOOLING, AND LABOR REQUIRED TO FABRICATE THE CORE AS DOCUMENTED ON THE TECHNICAL DRAWINGS DEVELOPED IN WBS 1.0. SUFFICIENT CORE PIECES SHALL BE PRODUCED TO SUPPORT TESTING BY ATK AND TO SUPPLY THE REQUIRED DELIVERABLE SEGMENTS TO NASA. THE DELIVERED ELECTRONIC DATA SHALL INCLUDE NOT ONLY THE POINT WISE PERFORMANCE METRIC VALUES, BUT ALSO ALL ASSOCIATED DATA, E.G. CURVES, USED TO DETERMINE THE PERFORMANCE METRIC VALUES. WBS 3.0 PROCESS EVALUATIONS. ATK SHALL DEMONSTRATE THE ABILITY TO JOIN CORE SEGMENTS INTO EFFECTIVELY LARGER SEGMENTS AT EITHER AMBIENT CONDITIONS OR IN OVEN CURE ENVIRONMENTS. ATK SHALL DEMONSTRATE THE ABILITY TO ASSEMBLE AND CONSOLIDATE FACESHEETS TO THE CORE SEGMENTS