9. Part 6 - System

This part provides an overview of existing methods for system applications, followed by the consideration of specific aspects relevant to space applications, including:

• Reliability assessment of phased missions,

• The use of importance measures for system optimization,

• Assessment of degraded system modes,

• Modelling of common cause failures and system level considerations for degradation failures.

A dedicated section, on non-part related systematic failures includes a satellite level anomaly occurrence model derived from in-orbit return, as well as a specific discussion on the consideration of software-related failures, in the context of reliability prediction for space applications.

This part contains the following sections:

• 9.1. Scope
• 9.2. Normative References
• 9.3. Terms, definitions and abbreviated terms
• 9.4. Reliability prediction for system level items
  • 9.4.1. Reliability prediction at different levels
  • 9.4.2. Root causes coverage
  • 9.4.3. System level methods
  • 9.4.4. Reliability assessment of phased missions
  • 9.4.5. Important measures
  • 9.4.6. Reliability assessment of degraded systems
  • 9.4.7. Modelling of common cause failure
  • 9.4.8. System level modelling of degradation
  • 9.4.9. Systematic failure modelling
  • 9.4.10. Consideration of software failures
• 9.5. Annex A: Modelling results
• 9.6. Bibliographic references