• 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. 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.  4.3  Content  Table E.1: Components of a HAW  Hazard ID  Hazard Description  Cause System State  Alpha-numeric identifier  (under 10 characters)  Any real or potential  condition that can  cause injury, illness, or  death to people;  damage to or loss of a  system, equipment, or  property; or damage to  the environment  The origin of a hazard  An expression of the  various conditions,  characterized by  quantities or qualities, in  which a system can  exist  Controls  Control Justification  Any means currently reducing a  hazard’s causes or effects  A justification for each control, indicating its effect on the  identified hazard’s causes or effects  Controls:  E_SRMGSA_202003 Originally published March 2020  Uncontrolled copy when downloaded  E-4 