Risk consequence scales as routinely applied by specialist professions not specialist in risk assessment,  refer to single fatality events as “Catastrophic”, many potential events can reasonably be expected to result in multiple fatalities.  This type of event is particularly relevant where large numbers of people are exposed or where high energies are involved. High hazard process plants, air or train travel, ferry..

The following article prepared by Navigatus considers the effect of prior duty hours on aviation technical crew fatigue.  It forms part of the research underpinning the night operations safety case at Queenstown aerodrome for jet regular passenger transport operations.   Pilot Fatigue – The effect of prior duty sectors and hours  ..