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CASA's approach to fatigue management
The International Civil Aviation Organization (ICAO) has established four basic scientific principles which should underpin fatigue management regulations:
- the need for adequate sleep and the impact of extended time awake
- the impact of sleep loss and recovery
- daily rhythms in the ability to perform work that are driven by the brain's circadian clock
- the influence of workload.
These are reflected in CAO 48.1 Instrument 2019.
Fatigue management is a shared responsibility between pilots and operators.
Under CAO 48.1 Instrument 2019, operators mitigate these effects through two broad methods:
- a prescriptive approach (appendices 1 to 6), or
- a performance-based approach under a fatigue risk management system (appendix 7).
A prescriptive approach with basic limits (appendix 1) is the simplest method to implement; however, this approach may not provide sufficient flexibility for most operators.
A more complex prescriptive approach (appendices 2 to 6) provides increasing flexibility with a corresponding increase in management overhead. CASA has developed a number of prescriptive appendices optimised for different types of operation.
The most flexible approach is a fatigue risk management system which addresses the specific risks applicable to the intended operation; however, this approach has additional requirements to ensure an equivalent level of safety is achieved.
Fatigue at a glance