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## 3.1 Overview 

## 3.1.1 Overview of the SRM Process 

This chapter provides a linear Safety Risk Management (SRM) process to follow, guidelines to identify safety hazards and mitigate their risks, and requirements for the development of consistent and thorough safety analyses. Using the steps in this chapter to perform a safety analysis will not always result in an exhaustive study of air traffic procedures, operations, or National Airspace System (NAS) equipment (i.e., hardware and software). The appropriate level of detail in a safety analysis depends on the complexity, size, and potential effect of the NAS change or existing safety issue. 

This chapter focuses solely on describing the key concepts and five phases of the safety analysis process. Refer to Section 5 and Section 6 for more detailed information on the administrative requirements regarding the development of safety documentation and the tracking of hazards and risk using the Safety Management Tracking System. Refer to Section 5 for SRM documentation requirements. Figure 3.1 provides a high-level depiction of the key steps, decision points, and outputs of the SRM process. 

<img src='content_image/600607.jpg'>

## 3.1.2 SRM Safety Analysis Phases 

Performance of a safety analysis is broken down into a five-phase process called the DIAAT, presented in Figure 3.2. Consistent with International Civil Aviation Organization guidelines and best practices, these five SRM phases apply to all SRM activity, whether the activity pertains to Air Traffic Organization operations, maintenance, procedures, or equipment development. Systematically completing the steps outlined in the five phases supports a thorough and consistent safety analysis. 

The DIAAT phases are described in detail in Section 3.3 through Section 3.7. 

