Mitigating and Monitoring Flight Crew Fatigue on a Westward Ultra-Long-Range Flight

54% of flight crew napped prior to the outbound flight, which did not affect in-flight sleep quality.

• Primary crew reported an average of 4.3 hours of sleep during the outbound flight and 4.0 hours on the inbound flight.
• Secondary crew had less average sleep at 2.9 hours on the inbound flight.
• Subjective ratings of fatigue and sleepiness increased and performance decreased across flights.
• Primary crew experienced less fatigue and sleepiness than Secondary crew, especially during critical phases like descent.
• Crewmembers adapted their sleep patterns, achieving more sleep in the first 24 hours of layover compared to the last.

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