This document is a guideline derived from scientific studies on mostly busy en-route ATC centres. In most cases, the guidelines will be applicable to less busy ATC units. However, when considering deviating from recommended figures for fatigue elements in this document, it is recommended to perform safety and human factors assessments.

The overall effectiveness of a rostering system in managing risks from occupational fatigue stems from a balanced variety of elements, complementing each other. While any of the eight parameters of EU373/2017 sets a limit of its own, together they are designed as a system. Thus, certain elements may compensate for others.

The guidelines in this document shall not be applied in isolation by looking only at fatigue elements of an ATM roster. Rather, they should be applied as a whole.

When implementing (or expanding) a fatigue risk management system (FRMS) at ANSP level, this document could be considered useful guideline for other categories of staff that perform shift work, such as ATSEP, MET, AIS, Flow, etc.