3. The Safety Analysis and Risk Mitigation Process 3.1 Overview 3.1.1 Overview of the SRM Process  3.1.2 SRM Safety Analysis Phases  3.2 Scope of the SRM Process  3.2.1 When to Perform a Safety Analysis  3.2.2 When a Safety Analysis May Not Be Required  3.2.2.1  Overview  3.2.2.2  NAS Change Proposal  3.2.2.3  Examples of NAS Changes Unlikely to Require a Safety  Analysis  3.3 DIAAT Phase 1: Describe System  3.3.1 Overview  3.3.2 Bounding and Scoping Safety Analyses  3.3.2.1  Bounding Safety Analyses in an Integrated NAS  3.3.2.2  Required Depth and Breadth of the Analysis  3.3.2.3  Involving Other FAA LOBs  3.3.2.4  Setting the Scope of the Analysis  3.3.3 Defining the System / NAS Change  3.3.3.1  Describe the System and the NAS Change  3.3.3.1.1 Overview 3.3.3.1.2 Considerations when Defining the System  3.3.3.2  5M Model Method  3.4 DIAAT Phase 2: Identify Hazards  3.4.1 Overview  3.4.2 Potential Sources of Hazards  3.4.2.1  Existing Hazards  3.4.2.1.1 Identified but Not in the Scope of an Ongoing NAS  Change  3.4.2.1.2 Hazards Identified by Audits  3.4.2.1.3 Hazards Identified by Top 5  3.4.2.1.4 Emergency Modifications  3.4.2.1.5 Existing High-Risk Hazards  3.4.3 Elements of Hazard Identification  3.4.3.1  Techniques for Hazard Identification and Analysis  3.4.3.1.1 Developing a PHL  3.4.3.1.2 Developing a HAW  3.4.3.1.3 Other Accepted Tools and Techniques  3.4.4 Causes and System State Defined  3.4.5 Addressing Hazards that Cross FAA Lines of Business  3.4.5.1  Hazard Escalation and Reporting  3.5 DIAAT Phase 3: Analyze Risk  3.5.1 Overview  ii 