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NASA MSFC HDBK 3074 : 2002

Current
Current

The latest, up-to-date edition.

SELECTION METHODOLOGY FOR ORBITAL REPLACEABLE UNITS
Published date

01-01-2002

FOREWORD
1.0 SCOPE
2.0 APPLICABLE DOCUMENTS
2.1 Applicable Documents
2.2 Reference Documents
3.0 ACRONYMS AND DEFINITIONS
3.1 Acronyms and Abbreviations
3.2 Definitions
4.0 THE NEED FOR AN ORU SELECTION PROCESS
5.0 EFFECTIVE ORU SELECTION IS INTEGRAL TO SUPPORTABILITY
    AND SYSTEMS ENGINEERING
5.1 Systems Engineering
5.2 Supportability Engineering
5.3 ORU Selection
6.0 ORU SELECTION METHODOLOGY
6.1 Initial data
    6.1.1 Collect the system RMS requirements
    6.1.2 Identify the system architecture
    6.1.3 Allocate the RMS requirements to the system
          architecture
    6.1.4 Identify the maintenance items
    6.1.5 Identify the ORU selection criteria
6.2 Initiate the ORU selection process/flowchart
6.3 Reiterate the ORU selection process as the system
    definition matures
7.0 ORU DESIGN CONSIDERATIONS
7.1 Safety
7.2 Reliability
7.3 Human factors
    7.3.1 Accessibility
    7.3.2 Interfaces
    7.3.3 Restraints
    7.3.4 Handling
    7.3.5 Labeling
7.4 Other design considerations
    7.4.1 Special tools or equipment
    7.4.2 Commonality
    7.4.3 Design packaging
    7.4.4 Fault detection, isolation and recovery (FDIR)
    7.4.5 Maintenance verification
    7.4.6 Repair level analysis (RLA)
    7.4.7 Technical data and documentation (TD&D)
8.0 SUMMARY
Appendix A - ORU Selection Flowchart Logic
Appendix B - ORU Selection Flowchart Logic Worksheets

Provides guidance on selecting the appropriate ORU items to ensure that a flight system is supportable on-orbit.

DocumentType
Standard
PublisherName
National Aeronautics and Space Administration
Status
Current

MIL STD 1843 : 0 RELIABILITY-CENTERED MAINTENANCE FOR AIRCRAFT, ENGINES AND EQUIPMENT
NASA STD 3000 VOL 3 : 1994 MAN-SYSTEM INTEGRATION STANDARDS - VOLUME 3
NASA STD 3000 VOL 2 : 1995 MAN-SYSTEMS INTEGRATION STANDARDS - VOLUME 2
NASA STD 3000 VOL 1 : 1995 MAN-SYSTEMS INTEGRATION STANDARDS - VOLUME 1

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