Prior sleep, prior wake, and crew performance during normal flight operations.

Area of Science:

• Aviation Safety
• Human Factors
• Occupational Health

Background:

• Industries operating non-daytime hours face elevated fatigue-related safety risks.
• Fatigue's role in workplace accidents is increasingly understood, but its impact in multicrew environments remains less clear.
• Multicrew operations involve complex interactions and environments, heightening safety concerns related to crew fatigue.

Purpose of the Study:

• To investigate the relationship between prior sleep and crew performance in commercial aviation.
• To assess the impact of sleep restriction and wakefulness on operational safety in multicrew flight operations.
• To evaluate the utility of subjective sleep assessments in fatigue risk management.

Main Methods:

• Data collected via expert observers during 302 commercial short-haul jet operations.
• Crewmembers self-reported sleep duration (24h, 48h) and wake time.
• Threat and Error Management (TEM) Model used for standardized operational performance data collection.

Main Results:

• Sleep restriction within 24h and 48h prior to flight was linked to altered Threat and Error Management performance.
• Less than 6 hours of sleep in the prior 24 hours correlated with degraded operational performance and higher error rates.
• Total prior wake time did not show a significant association with changes in crew performance.

Conclusions:

• Prior sleep duration is a critical variable influencing fatigue-related risks in aviation.
• Subjective sleep assessments can be a valuable component of comprehensive fatigue risk management systems.
• Findings support the integration of sleep monitoring into strategies for enhancing flight safety.