Safety Management and Human Factors in Air Navigation
What is examined
Safety management and human factors tests SMS principles and how human performance affects navigation. Expect the four SMS pillars, risk assessment, just culture, error models, fatigue, situational awareness and CRM.
Core concepts
- SMS has four pillars: safety policy and objectives, safety risk management, safety assurance, and safety promotion.
- Risk = severity × likelihood. A risk matrix ranks hazards; mitigation must reduce risk to an acceptable level.
- Just culture distinguishes inadvertent error from reckless or intentional violation; reporting is protected but accountability remains.
- SHELL model: Software, Hardware, Environment, Liveware; mismatch at interfaces creates error.
- Threat and error management: anticipate threats, trap errors, manage undesired aircraft states.
- Fatigue, complacency, confirmation bias and poor communication are recurring causes in navigation errors.
Worked example
A crew files a route with a waypoint that is close to a restricted area. In a 5×5 matrix, the hazard is assessed as severity 4 (major) and likelihood 3 (occasional), giving a risk index of 12 - high/red. Mitigation: re-route the flight plan, brief the boundary, add a monitoring waypoint and confirm with ATC. After mitigation, severity may remain 4 but likelihood falls to 1 (remote), giving 4 - acceptable with monitoring. The reasoning shows that risk assessment is not just a label; it changes the plan.
Traps
Treating SMS as paperwork; using likelihood alone; confusing error with violation; ignoring fatigue and workload; assuming automation removes situational awareness.