The Safety Analysis and Risk Mitigation Process  Section 3  1 9 3.1_SMSM_201607  Originally published July 2016  Uncontrolled copy when downloaded The DIAAT phases are described in detail in Section 3.3 through Section 3.7.  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.  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.  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.  3.1 Overview  3.1.1  Overview of the SRM Process  3.1.2  SRM Safety Analysis Phases  Figure 3.1: SRM Process  NAS Change Affects safe  provisioning of  ATM services? 3.2.1, 3.2.2 No further analysis  required N o Introduces new hazards or  increases  safety risk? 3.4 Yes No Determine  controls and  potential hazar effects 3.5.2, 3.5.3 d  Yes Determine severity  and likelihood;  identify risk level 3.5.4 Define safety risk  mitigation  strategy; define  monitoring plan 3.7, 4 Safety Risk  Management  document 5.4 Process Output Describe the System and Identify Hazards Analyze and Assess Risk Treat Risk Existing Safety  Issue