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Unformatted text preview: ed two extra crew members. It should be noted that no attempt was made to assess the design capability or design cost impacts to accommodate these extra crew members. The savings of crew due to halving the number of ORU replacements is small, effectively one less crew member for half the year. Figure B-15 shows the number of Space Shuttle flights over five years needed to maintain the nominal available upmass. The Space Shuttle flights were rounded upward to obtain whole flights. Doubling the number of ORU replacements would mean eight extra Space Shuttle flights would be needed over five years. Halving the ORU replacements would require two fewer Space Shuttle flights over five years. No attempt was made to assess the Space Shuttle capability to provide the extra flights or the design cost impacts to create the ORUs with the different reliabilities. Figure B-16 shows the effect of assessing the cost impact of the previous two figures and combining them with the five-year operations cost. The influence of MTBF is effectively doubled when the resources of available upmass and crew time are maintained at their nominal values. NASA Systems Engineering Handbook NASA Systems Engineering Handbook Appendix B.9 -- An Example of a Verification Requirements Matrix Appendix B.9 is a small portion of the Verification Requirements Matrix (VRM) from the National Launch System Level III System Requirements Document, originally published at the Marshall Space Flight Center. Its purpose here is to illustrate the content and one possible format for a VRM. The VRM coding key for this example is shown on the next page. NASA Systems Engineering Handbook NASA Systems Engineering Handbook Appendix B.10—A Sample Master Verification Plan Outline Introduction 1.1 Scope 1.2 Applicable Documents 1.3 Document Maintenance and Control 2.0 Program/Project Description 2.1 Program/Project Overview an d Verification Master Schedule 2.2 Systems Descriptions 2.3 Subsystems Descriptions 3.0 4.0 5.0 Integration and Verification (I&V) Organization and Staffing 3.1 Program/Project Management Offices 3.2 NASA Field Center I&V Organizations 3.3 International Partner I&V...
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This document was uploaded on 02/26/2014 for the course E 515 at University of Louisiana at Lafayette.

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