Definition

A Fatigue Risk Management System (FRMS) has been defined by ICAO as "a data-driven means of continuously monitoring and maintaining fatigue related safety risks, based upon scientific principles and knowledge as well as operational experience that aims to ensure relevant personnel are performing at adequate levels of alertness".

Description

Historically, the aviation industry has taken a regulatory approach to fatigue prevention through the specification of flight and duty time limitations in a Flight Time Limitations (FTL) Scheme. This is done by limiting the number of hours aircrew can work and specifying the minimum rest time which is required before commencement of each flight duty period. The purpose of an FRMS is to support the safe application of such FTL Schemes by recognising the need for aircrew be adequately rested before commencing and during flying duties by facilitating both proactive and reactive interventions in relation to the implementation of FTL Schemes.