Fri, Nov 21, 2008
Safety Assessment
  • Fault Tree Analysis
    • For "Hazardous" and "Catastrophic" Classification
    • GTPROB Numerical Solution
    • Minimum Cutset (minimum probability, number and names of basic and intermediate events required to cause top event)
    • Ranking of fault events
    • Large format (36"x48") printout of continuous sheet of paper
    • Follows Single Thread End-End Schematic of system function
    • Software Assessed qualitatively to determine safety levels
    • Mitigated events in "Green"
    • Mitigations implemented in design in "Green"
    • Events and mitigations not implemented in design in "Red"
  • Functional Hazard Assessment
    • Including software contribution to system hazards follows guidelines of ARP 4754 Certification Considerations of Complex Integrated Aircraft Systems
    • Starts with System Functional Requirements failure conditions
    • Assesses Hazard Severity Effects
    • Provides rationale for effects
    • Formally initiates safety requirements
  • Safety Architecture Assessment
    • Requirements Capture and Validation
    • Partitioning Integrity Analysis
    • Design Category Assessment
    • Multiple, dissimilar channels with independence, active monitor parallel, partitioned and so on
    • Isolation techniques such as firewalls, safety ports
    • Watch Dog timer implementation
    • Safety Monitor
    • Numerical Assurance
  • Failure Mode Effects and Criticality Analysis
    • (follow guidelines of MIL-STD-1629A/Safety Assessment Method for Civil Airborne Systems)
  • Common Mode Analysis
    • Mitigation against Common Mode Failure (CMF)
  • Zonal Safety Analysis
    • Cable Harness Assembly, Shielding, Isolation, Routing; Failure Containment
  • Lightning Susceptibility
  • EMI/EMC/HIRF Analysis
    • RTCA/DO-160 Environmental Testing
  • MIL-STD-882C Safety Program
    • Preliminary Hazard List
    • Preliminary Hazard Analysis
    • System Safety Program Plan
    • Safety Requirements Criteria Analysis
    • Hazard Tracking Data Base
    • Safety Assessment Report (including a signed statement accepting risk)
    • Subsystem/System Hazard Analysis (including bottoms-up software hazard analysis)
    • Safety Verification
    • Operations and Support Hazard Analysis
    • Human Error Modeling
    • Computer-Human Interface (CHI) Design Mitigations
  • Reliability Predictions using computer program RELCALC
AERO&SPACE USA Aviation program:   Projects |  Safety Assessment |  Design Assurance
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Fullerton CA 92831
Tel: (714) 990 1924
Fax: (714) 990 1008
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