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• Functional Hazard Assessment : A methodical approach to identifying credible operational safety effects through the assessment of system or sub-system functions and failure conditions. 

• Preliminary Hazard List:  A list of hazards determined in previous safety analyses or brainstorming. 

• Hazard Checklist:  A list of the causes of safety incidents with the same or similar equipment. 

• Customer Requirements:  Any pre-existing requirement specifications and concept documents. 

• Regulatory Requirements:  Constraints imposed by regulatory agencies. 

• Previously Conducted Safety Analyses:  Any relevant information from safety assessments (e.g., OSAs, CSAs, or Safety Collaboration Team studies) already conducted. 

• Development Assurance Levels (DALs):  The DAL is the mitigation for a hazard of a design error. Each function should consider the result of a design error causing a loss of function or misleading function and assign an appropriate system, hardware, and software DAL. 

## 4.3 Content 

The PHA must be written in accordance with the requirements of the SMS Manual . Table E.1 is the basic HAW that is used to develop the PHA. The description of each identified hazard must contain, at a minimum, the information presented in Table E.1. 

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## Controls: 

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