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https://www.nationalacademies.org/trb/events

Aeromedical HFACS Nanocode Review and Validation

The Office of Aerospace Medicine (AAM) has developed a specialized Human Factors Analysis and Classification System (HFACS) nanocode framework designed to systematically capture medical contributors to aviation accidents. This innovative taxonomy aims to link latent or undetected pilot health issues to unsafe acts and broader systemic oversight deficiencies, thereby enhancing the Federal Aviation Administration's (FAA’s) ability to understand and mitigate medically related accident risks. However, before this framework can be operationalized within FAA safety programs, it requires rigorous, independent validation to ensure its reliability, usability, and overall effectiveness in real-world applications. The core objective of this research is to evaluate whether the nanocode system accurately identifies causal medical factors in aviation accidents and supports improved aeromedical decision-making. To achieve this, the study will address key questions: How consistently can trained analysts apply the nanocode framework to actual accident cases? Does the framework clearly capture essential medical and supervisory contributors to unsafe acts? And, what refinements are necessary to enhance its clarity, usability, and integration with other FAA safety analysis systems? The answers to these questions will determine the readiness of the framework for widespread implementation and inform future training, oversight protocols, and policy guidance within the FAA’s aeromedical and safety assurance ecosystems.