Fatigue
Reduced alertness from sleep loss and circadian disruption — a regulated safety issue with a reporting system you are obliged to use.
Definition
Fatigue in aviation is a physiological state of reduced mental and physical performance caused by sleep loss, extended wakefulness, circadian disruption or workload, which impairs alertness and the ability to operate safely. It is treated as a safety hazard rather than a personal failing: every airline under EASA, FAA or GCAA oversight must run a fatigue reporting system, usually within a Fatigue Risk Management System, and crew are obliged not to operate when they know or suspect they are unfit through fatigue.
What it means for you
Fatigue is the price of the roster, and the job is to manage it rather than deny it. Learn what your airline's fatigue policy says, file fatigue reports when a pattern leaves you unfit — that data is what changes rosters — and know that calling in fatigued is a protected safety action, not a sick call, even if the culture around it varies. The long-term effects of chronic fatigue are covered in the sleep and mental-health guides on this site.
In practice
Indian aviation's ongoing fatigue debate centres on domestic low-cost patterns of 4-6 sectors a day with pre-dawn sign-ons; in the Gulf the fatigue price is ultra-long-haul turns of 16 hours and more.
Go deeper
Related terms
4 terms- Body clockCrew lifeYour internal circadian rhythm, which FTL rules recognise through the window of circadian low and which a flying roster constantly fights.
- Jet lagCrew lifeBody clock out of step with local time after crossing time zones — the long-haul crew's occupational hazard, and a skill to manage.
- FTLRegulationFlight time limitations — a regulator's legal caps on duty, flight hours and minimum rest: the only hard limit on what a roster can ask.
- Rest periodRoster & schedulingThe uninterrupted time free of all duties that must separate two duties: 12 hours at base and 10 away under EASA, 10 hours under the FAA.