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
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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
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
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