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Analysis Workflow Overview

The following diagram shows how the major analysis types flow together in a typical aerospace safety program: diagram

Key Analysis Types

AnalysisPurposeWhen to UseStart Here
FHAIdentify system-level failure conditions and classify severityAt system design phaseFHA Workflows
SFMEAAnalyze subsystem failure modes and evaluate risk prioritiesAfter FHA is baselinedSFMEA Workflows
DFMEAAnalyze component-level failure modes and design traceabilityIn detailed design phaseDFMEA Workflows
FTADevelop fault trees for complex failure scenariosAs needed for high-criticality itemsFTA Guide
CCAAnalyze common cause failure eventsFor redundant / diverse architecturesCCA Guide
PSSA/SSAConduct preliminary and system safety assessmentsAt design review and integration gatesPSSA/SSA Guide
SecurityDO-326A threat assessment and cybersecurity requirementsThroughout development lifecycleSecurity Guide

Common Workflows

New to the solution? Start here: Running a complete safety analysis? Follow this sequence:
  1. Create a New Risk Analysis Document
  2. Identify Failure Conditions
  3. Classify Failure Effects and Severity
  4. Assign DAL to Failure Conditions
  5. Link Safety Requirements to Failure Conditions
Performing detailed design analysis? Generating compliance artifacts?

Organization by Role