Publication Date
1-1-2021
Document Type
Article
Publication Title
Aerospace Medicine and Human Performance
Volume
92
Issue
2
DOI
10.3357/AMHP.5672.2021
First Page
83
Last Page
91
Abstract
BACKGROUND: In-flight breaks are used during augmented long-haul flight operations, allowing pilots a sleep opportunity. The U.S. Federal Aviation Administration duty and rest regulations restrict the pilot flying the landing to using the third rest break. It is unclear how effective these restrictions are on pilots’ ability to obtain sleep. We hypothesized there would be no difference in self-reported sleep, alertness, and fatigue between pilots taking the second vs. third rest breaks. METHODS: Pilots flying augmented operations in two U.S.-based commercial airlines were eligible for the study. Volunteers completed a survey at top-of-descent (TOD), including self-reported in-flight sleep duration, and Samn-Perelli fatigue and Karolinska Sleepiness Scale ratings. We compared the second to third rest break using noninferiority analysis. The influence of time of day (home-base time; HBT) was evaluated in 4-h blocks using repeated measures ANOVA. RESULTS: From 787 flights 500 pilots provided complete data. The second rest break was noninferior to the third break for self-reported sleep duration (1.5 6 0.7 h vs. 1.4 6 0.7 h), fatigue (2.0 6 1.0 vs. 2.9 6 1.3), and sleepiness (2.6 6 1.4 vs. 3.8 6 1.8) at TOD for landing pilots. Measures of sleep duration, fatigue, and sleepiness were influenced by HBT circadian time of day. DISCUSSION: We conclude that self-reported in-flight sleep, fatigue, and sleepiness from landing pilots taking the second in-flight rest break are equivalent to or better than pilots taking the third break. Our findings support providing pilots with choice in taking the second or third in-flight rest break during augmented operations.
Keywords
augmentation, circadianerhythm, in-flight sleep, rest bre ak
Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License
Department
Research Foundation
Recommended Citation
Kevin B. Gregory, Rhiannon N. Soriano-Smith, Amanda C.M. Lamp, Cassie J. Hilditch, Michael J. Rempe, Erin E. Flynn-Evans, and Gregory L. Belenky. "Flight Crew Alertness and Sleep Relative to Timing of In-Flight Rest Periods in Long-Haul Flights" Aerospace Medicine and Human Performance (2021): 83-91. https://doi.org/10.3357/AMHP.5672.2021
