HFACS Level 2: Preconditions for Unsafe Acts

Environmental Factors • Physical Environment: (e.g., weather, altitude, terrain) and the ambient environment (e.g., heat, vibration, lighting, toxins). • Technological Environment: a variety of design and automation issues including the design of equipment and controls, display/interface characteristics, checklist layouts, task factors and automation. Condition of Operators • Adverse Mental State: (e.g., stress, mental fatigue, motivation). • Adverse Physiological State: (e.g, medical illness, physical fatigue, hypoxia). • Physical/Mental Limitation: (e.g., visual limitations, insufficient reaction time). Personnel Factors • Crew Resource Management: factors that include communication, coordination, planning, and teamwork issues. • Personal Readiness: Refers to off-duty activities required to perform optimally on the job such as adhering to crew rest requirements, alcohol restrictions, and other off-duty mandates