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1.0 INTRODUCTION .............................................................................................................11 1.1 Purpose ...............................................................................................................................11 1.2 Scope ..................................................................................................................................11 1.3 Change Authority/Responsibility.......................................................................................11 2.0 DOCUMENT .....................................................................................................................11 3.0 SLS OVERVIEW ..............................................................................................................12 3.1 SLS Block Configuration Descriptions .............................................................................13 3.2 SLS Vehicle Coordinate System ........................................................................................14 3.3 SLS Block 1 Vehicle Configuration ..................................................................................15 3.4 SLS Block 1B Vehicle Configuration................................................................................17 3.5 SLS Block 2 Vehicle Configuration ..................................................................................19 3.6 Initial SLS Development Timing and Mission Applications .............................................21 4.0 SLS MISSION DESIGN AND PERFORMANCE ...........................................................22 4.1 Mission Trajectories and Performance Options .................................................................22 4.1.1 Nominal Ascent Profile ........................................................................................23 4.1.2 Earth Orbit ............................................................................................................24 4.1.3 Lunar Vicinity ......................................................................................................25 4.1.4 Earth Escape .........................................................................................................28 4.2 SLS Mission Performance to Destination ..........................................................................29 4.2.1 SLS Mass Delivery Performance Definitions ......................................................29 4.2.2 SLS Performance Margin and Reserve Approach ...............................................29 4.2.3 SLS Earth Orbit Performance ...............................................................................30 4.2.4 SLS Lunar Vicinity Performance .........................................................................35 4.2.5 SLS Earth Escape Performance ............................................................................36 5.0 ENVIRONMENTS ............................................................................................................37 5.1 Structural Loads .................................................................................................................37 5.2 Thermal Environments.......................................................................................................38 5.2.1 SLS Block 1 Crew Configuration Thermal Environments ..................................39