Any effective SMS begins with a thorough risk analysis. Aviation oxygen risk assessment has gone largely unchanged for more than 60 years. As such, ADS has conducted a meticulous re-examination of oxygen and its role in current aviation practices. Accounting for dramatic changes in technology, wider performance variables and the sheer volume of contemporary air travel, ADS has produced the most comprehensive oxygen risk analysis in aviation. It is this risk analysis that forms the basis of the ADS Oxygen SMS component.