Aviation Safety Management Systems: A Foundation for Reliability in Highly Complex Industries

Giacomo Belloni 6 min read

In my previous article, “High Reliability: What Commercial Aviation Can Teach and Export to the World of Complex Industries”, I examined what other complex systems can learn from commercial aviation’s experience in operational safety and efficiency. Over recent decades, air transport has become one of the safest sociotechnical systems in the world, even as traffic, connections and the complexity of the organisations involved have grown.

According to the International Air Transport Association (IATA, 2020), global air transport handles very high traffic volumes and increasingly dense operations, with more connections and closer interactions across the system. The result is an aviation system of considerable complexity.

This density requires advanced technologies that allow aircraft separation to be reduced where appropriate, while maintaining high levels of safety. These technological capabilities, however, must also be considered within the increasingly demanding operational environment they help support. The sheer volume and density of traffic make the aviation system increasingly complex to manage, particularly when high levels of operational efficiency must be achieved without compromising safety.

At the same time, all this takes place in a highly competitive market, where organisations must maintain financial sustainability while continuing to improve operational performance and safety.

Within such a complex and highly interconnected system, technology and procedures provide essential support, but effective operations also depend on the people who manage, coordinate and make decisions within it. Operators therefore remain central to the system’s ability to function safely and efficiently. Its resilience depends not only on the reliability of technology and procedures, but also on operators’ ability to adapt to changing conditions, address emerging difficulties and maintain control of operations.

Safety should therefore be seen as a strategic investment. Higher levels of safety can contribute to greater operational efficiency, fewer disruptions and better use of resources, helping operations remain financially sustainable in a highly competitive market.

Much of the improvement in aviation safety has come from technological innovation, but technology is only part of the story. Safety culture has also changed considerably, as has the way organisations approach safety and recognise the role of the people working within the system. The introduction and development of the Safety Management System (SMS) have played an important part in this evolution. Its international regulatory framework was consolidated in 2013 with the adoption of Annex 19 by the International Civil Aviation Organization (ICAO, 2013).

For a long time, explanations of accidents were predominantly linear and focused on the individual. Events were attributed to human error, often followed by efforts to assign responsibility and introduce further corrective procedures. This approach could add to regulatory and operational complexity without necessarily improving overall safety, because it did not adequately account for the interconnected nature of aviation systems and their many organisational levels.

The development of safety science, strongly influenced by James Reason’s work, helped establish a systemic perspective in which accidents arise from interacting latent conditions and active failures across organisations, technology and operators (Reason, 1997). From this perspective, human error is no longer a sufficient explanation for an accident. The question also becomes what conditions within the system allowed that error to occur. Subsequent work has shown how human performance varies and adapts under operational constraints such as cognitive workload, time pressure, stress and fatigue (Dekker, 2011; Hollnagel, 2014). In real operations, uncertainty and variability make error inevitable over time. Yet operators’ ability to adapt, compensate and recover also helps the system function safely.

The pilot, and the operator more broadly, is therefore a vital source of resilience, bridging the gap between system design and operational reality. These are the differences between work as imagined by those who design systems and write procedures, and work as it is actually done. Understanding them requires listening to the people who deal with operating conditions every day.

SMS developed within this broader change in how aviation manages safety and has four main components: safety policy and objectives, safety risk management, safety assurance and safety promotion. What matters, however, is how these principles are put into practice. SMS combines reactive approaches with proactive and, where possible, predictive methods.Data collection and analysis can help organisations identify weak signals, operational deviations and emerging patterns before they develop into critical events. The information gathered can then be used to recognise trends across the system and guide action (ICAO, 2018).

Another important element is Just Culture, extensively discussed by Sidney Dekker and other safety researchers. It encourages an environment in which operators can report errors, anomalies and concerns without fear of punishment, distinguishing mistakes made in good faith from deliberately harmful conduct, wilful violations and gross negligence. This is essential to maintaining a rich and reliable flow of information. Without it, a safety management system would remain blind to its own vulnerabilities. Trust grows when people receive feedback and can see how their reports have been followed up (Dekker, 2016).

More and better information allows organisations to understand everyday operations more fully. Operators contribute to this understanding through their observations and their knowledge of how the work is carried out.

Continuous learning is equally important. In a mature SMS, every event, including those with less serious consequences, can teach the organisation something about how the system is working. Systemic analysis looks beyond the immediate cause to examine the conditions that made the event possible. This approach is consistent with organisational learning and high reliability theory: highly reliable organisations pay close attention to anomalies and learn quickly from operational experience (Weick & Sutcliffe, 2007). Learning can address individual behaviour while also improving the system’s ability to adapt and respond to variability.

SMS is also effective when it addresses complexity without oversimplifying it. Aviation involves dynamic interactions, high levels of automation and very little room for error. SMS examines the relationships between different parts of the system, drawing on engineering, operational and human perspectives. This is consistent with the approach to operational resilience developed by Erik Hollnagel, in which safety extends beyond preventing adverse events to include the system’s ability to adapt to changing and unpredictable conditions while maintaining control of operations (Hollnagel, 2014). Human performance variability must therefore be understood and managed, recognising both its contribution to safety and the risks it can bring.

The principles that make SMS effective in aviation are relevant to other complex sectors where people and machines interact, reliability is essential and errors can have serious consequences.

Transferring SMS to another sector, however, requires more than adopting procedures or tools. It calls for cultural change, leadership committed to safety, reliable systems for collecting and analysing information and, above all, trust between operators and the organisation. Without these conditions, there is a real risk of creating a system that demonstrates compliance on paper but has little effect on operational safety.

The success of SMS lies both in reducing accidents and in broadening our understanding of safety. A safe system must be able to function effectively under conditions that vary and are often unpredictable. Human contribution is a fundamental resource for resilience, alongside the risks that require management. Other complex industries can draw on aviation’s experience in bringing technology, organisation and human adaptability together to improve safety and reliability.

References

Dekker, S. (2011). Drift into failure: From hunting broken components to understanding complex systems. Ashgate.

Dekker, S. (2016). Just culture: Restoring trust and accountability in your organization (3rd ed.). CRC Press.

EUROCONTROL. (2016). Performance review report: An assessment of air traffic management in Europe.

Hollnagel, E. (2014). Safety-I and Safety-II: The past and future of safety management. Ashgate.

International Air Transport Association. (2020). Safety report 2019.

International Civil Aviation Organization. (2013). Annex 19 to the Convention on International Civil Aviation: Safety management (1st ed.).

International Civil Aviation Organization. (2018). Safety management manual (Doc 9859, 4th ed.).

Reason, J. (1997). Managing the risks of organizational accidents. Ashgate.

Weick, K. E., & Sutcliffe, K. M. (2007). Managing the unexpected: Resilient performance in an age of uncertainty (2nd ed.). Jossey-Bass.