Fatigue is a well-recognised safety risk in aviation operations. Long duty periods, night operations, time-zone changes, irregular schedules and operational pressures can all contribute to fatigue and reduced alertness.
Effective fatigue risk management (FRM) is therefore essential to maintaining safe flight operations. It requires a combination of regulatory limits, organisational processes and individual responsibility to ensure that crew members are able to perform their duties safely.
Within the European regulatory framework, fatigue risk is addressed through the following:
- Flight Time Limitations (FTL) requirements that establish legal limits for flight duty periods, duty times and rest periods;
- Operator fatigue risk management processes, integrated within the operator’s management system;
- Scientific knowledge and operational experience, used to continuously improve fatigue mitigation strategies.
Together, these measures aim to ensure that fatigue risks are identified, assessed and mitigated before they can affect flight safety.
Flight Time Limitations (FTL)
EASA has established Flight Time Limitations (FTL) requirements within the Air Operations Regulation (EU) No 965/2012, primarily in ORO.FTL and the associated Certification Specifications.
These rules set minimum safety limits for areas such as maximum flight duty periods cumulative flight and duty time, minimum rest periods, standby and reserve duties, night operations and acclimatisation.
The purpose of the FTL framework is to provide a harmonised baseline across Europe to prevent fatigue-related safety risks. Operators must establish and comply with an FTL scheme for their flight crew members to ensure that operational schedules remain within safe limits.
Further guidance and rule material can be found in the Air Operations Implementing Rules and Acceptable Means of Compliance.
Latest Rulemaking Developments
Fatigue risks can vary significantly across different types of operations. To address these differences, EASA continues to update and refine the regulatory framework based on operational experience and scientific research.
In February 2026, EASA published Opinion No 02/2026, proposing harmonised and updated flight time limitation requirements for specific operational sectors including:
- Air taxi operations.
- Aeroplane Emergency Medical Services (AEMS).
- Single-pilot commercial air transport operations
The objective is to introduce state-of-the-art fatigue mitigation measures tailored to these operational environments, where duty patterns, operational flexibility and crew configurations differ from traditional airline operations. Currently these types of operations are regulated through Subpart Q and some national provisions, which create a non-harmonious implementation in Europe.
Promoting Effective Fatigue Risk Management
Improving fatigue risk management is also a priority within the European Plan for Aviation Safety (EPAS). EPAS actions focus on promoting effective implementation of FTL requirements, supporting fatigue risk management approaches within operators’ management systems, improving awareness of fatigue-related safety risks and encouraging collaboration between regulators, operators, crew representatives and scientific experts.
To support this objective, EASA regularly organises events and workshops dedicated to fatigue management aimed to support knowledge sharing across the aviation system and help ensure that fatigue risk management continues to evolve based on evidence and operational experience.
Information on the latest events and their output is available on this page under related content
Key Lessons for Effective Fatigue Risk Management
Recent discussions across industry and regulators highlight several key principles for effective fatigue risk management:
- Fatigue management is a shared responsibility: Safety depends on collaboration between operators, crew members, schedulers and regulators.
- Rules alone are not sufficient: FTL provides a baseline, but effective fatigue risk management also requires operational monitoring, reporting and continuous improvement.
- Data Quality: Challenges related to dealing with fatigue reporting, needs to be dealt with from a holistic approach, where full and comprehensive reports are required to allows a comprehensive assessment.
- Fatigue science should inform operational decisions: Scientific understanding of sleep, circadian rhythms and workload is essential for designing safer schedules.
- Safety culture supports fatigue reporting: Crew members must be able to report fatigue without fear of negative consequences. Data and experience improve the system. Operational data, fatigue reports and research all contribute to improving fatigue mitigation strategies.
- Effective FRM requires dialogue: All these activities come together to support an evolution from FTL compliance to effective FRM. Every operator’s situation, schedules and challenges are different so this takes open and positive discussion.
- Commander’s Discretion should only be for exceptional situations: It is not acceptable for any crew member to feel pressure to use Commander’s Discretion. This must remain an exceptional measure. Equally, no one should feel pressured to work when they are sick, fatigued, or otherwise unfit for duty
For more information and resources on this topic follow the dedicated area on the Air Ops Community