| 4.4.8-3-1 Ensure all system and space vehicle requirements are fully decomposed and appropriately allocated to the subsystem |
Phase A |
Phase B |
Phase C |
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Ensure all system requirements defined at System Requirements Review are verifiable, requirements are decomposed into the space vehicle with subsystem design by Systems Design Review, with design feasibility demonstrated by Preliminary Design Review and design shown to meet all requirements by Critical Design Review. System specifications and subsystem specifications completed at System Design Review, preliminary completed to unit/component at Preliminary Design Review, with final at Critical Design Review.
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NA
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NA
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Space Vehicle Systems Engineering Handbook (TOR-2006(8506)-4494; Mission Assurance Guide, TOR-2007(8546)-6018, Rev B
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| 4.4.8-3-2 Ensure requirements from applicable specifications and standards are identified and allocated to the subsystem |
Phase A |
Phase B |
Phase C |
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Ensure that specification and standard requirements and any program Critical Design Review requirements that affect the Subsystem are reflected in the space vehicle requirements. Ensure all system requirements defined at System Requirements Review are verifiable, requirements are decomposed into space vehicle subsystem design by System Design Review, design feasibility demonstrated by Preliminary Design Review and design shown to meet all requirements by Critical Design Review.
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NA
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NA
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Mission Assurance Guide, TOR-2007(8546)-6018, Rev B, Requirements Chapter; Space Vehicle Systems Engineering Handbook, TOR-2006(8506)-4494
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| 4.4.8-3-3 Ensure subsystem specification requirements are completely allocated to the unit level |
Phase A |
Phase B |
Phase C |
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Ensure all necessary units have been identified, and unit specifications are complete, according to program phase. Ensure driving unit requirements are defined by System Design Review, preliminary specifications by Preliminary Design Review and finals by Critical Design Review.
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NA
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NA
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Space Vehicle Systems Engineering Handbook (TOR-2006(8506)-4494; Mission Assurance Guide, TOR-2007(8546)-6018, Rev B
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| 4.4.8-3-4 Ensure unit requirements/specifications are self compatible within the subsystem |
Phase A |
Phase B |
Phase C |
Phase D1 |
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Ensure the unit-to-unit requirements are compatible (e.g. no contradictions and that the requirements are verifiable).
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NA
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NA
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Space Vehicle Systems Engineering Handbook, TOR-2006(8506)-4494; Mission Assurance Guide, TOR-2007(8546)-6018, Rev B
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| 4.4.8-3-5 Ensure a reasonable closure plan exists for all TBR and TBD requirements, and evaluate their potential effect on the design and component selection |
Phase A |
Phase B |
Phase C |
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Ensure all TBR and TBD requirements identified at System Design Review, are closed at Preliminary Design Review.
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NA
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NA
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Space Vehicle Systems Engineering Handbook, TOR-2006(8506)-4494; Mission Assurance Guide, TOR-2007(8546)-6018, Rev B
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| 4.4.8-3-6 Ensure late requirement changes are consistent with system level requirements |
Phase D1 |
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Ensure that any late changes are properly understood in terms of root causes, corrective actions, change planning, execution, and verification. Ensure impact to design, testing, verification as well as schedule, cost and overall risk is assessed.
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NA
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NA
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Space Vehicle Systems Engineering Handbook, TOR-2006(8506)-4494; Mission Assurance Guide, TOR-2007(8546)-6018, Rev B, Requirements chapter
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| 4.4.8-3-7 Ensure disposal requirements are adequate and realistic |
Phase A |
Phase B |
Phase C |
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Space policy requirements drive the disposal guidelines at end of mission. Systems will be operated for as long as possible, despite contractual procurement statements of mission life. Ensure that the disposal requirements take potential additional operational lifetime into account.
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NA
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NA
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Space Vehicle Systems Engineering Handbook, TOR-2006(8506)-4494; Test Requirements for Launch, Upper Stage, and Space Vehicles, TR-RS-2014-00016; Design and Test Requirements for Space Flight Pressurized Systems, TR-RS-2015-00005; Space Systems-Metallic Pressure Vessels, Pressurized Structures, and Pressure Components, AIAA S-080-1998; Space Systems-Composite Overwrapped Pressure Vessels, AIAA S-081A-2006; Criteria for Explosive Systems and Devices on Space and Launch Vehicles, AIAA S-113-2005; Moving Mechanical Assemblies for Space and Launch Vehicles, AIAA S-114-2005; Range Safety User Requirements, AFSPCMAN 91-710; Space Safety and Mishap Prevention Program, AFI 91-217 or equivalent; End-of-Life Disposal of Satellites in Geosynchronous Altitude, SMC-S-015; End-of-Life Disposal of Satellites in Low-Earth Orbit or equivalent SMC-S-022; Satellite Disposal Procedures or equivalent, SI 505-4; Space systems-Unmanned spacecraft-Estimating the mass of remaining usable propellant, ISO 23339:2010; Space systems-Space debris mitigation requirements, ISO 24113:2011
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