Figure 4-2 SLS Configuration for EM-1 MSA The MSA a common interface between the MPCV and the ICPS upper stage. A diaphragm, attached to the inside bottom of the MSA hardware, isolates the ICPS volume from the MPCV volume. For the EM-1 mission, the MSA will accommodate secondary payloads and all support equipment consisting of brackets, cabling, a battery, and a deployment sequencer. The MSA will provide the payload structural interface. The SLS Program is responsible for installing 12 bracket assemblies and the SPDS and its associated harnesses in the MSA. The bracket assemblies will support up to 11 manifested secondary payloads with the twelfth bracket assembly supporting the deployment system sequencer and battery. ICPS The ICPS is an in-space propulsion system that performs the LEO insertion, trans-lunar injection (TLI), and ICPS disposal maneuver. As the upper stage on SLS, the ICPS is integrated with the MPCV via the MSA which transitions the Outer Mold Line (OML) diameter of the ICPS to that of the MPCV. SPDS The SPDS manages the deployment of secondary payloads at designated points along the primary mission trajectory. The SPDS is comprised of an avionics box (sequencer and battery), a deployer, distributed cable harnesses, and ground support equipment. The SLS Program
Figure 4-2 SLS Configuration for EM-1 MSA The MSA a common interface between the MPCV and the ICPS upper stage. A diaphragm, attached to the inside bottom of the MSA hardware, isolates the ICPS volume from the MPCV volume. For the EM-1 mission, the MSA will accommodate secondary payloads and all support equipment consisting of brackets, cabling, a battery, and a deployment sequencer. The MSA will provide the payload structural interface. The SLS Program is responsible for installing 12 bracket assemblies and the SPDS and its associated harnesses in the MSA. The bracket assemblies will support up to 11 manifested secondary payloads with the twelfth bracket assembly supporting the deployment system sequencer and battery. ICPS The ICPS is an in-space propulsion system that performs the LEO insertion, trans-lunar injection (TLI), and ICPS disposal maneuver. As the upper stage on SLS, the ICPS is integrated with the MPCV via the MSA which transitions the Outer Mold Line (OML) diameter of the ICPS to that of the MPCV. SPDS The SPDS manages the deployment of secondary payloads at designated points along the primary mission trajectory. The SPDS is comprised of an avionics box (sequencer and battery), a deployer, distributed cable harnesses, and ground support equipment. The SLS Program
sls-secondary_payload_users_guide.docx