Citation

Holmes AL, Al-Bayat S, Hilditch C, Bourgeois-Bougrine S. Accid. Anal. Prev. 2012; 45S: S27-S31.

Affiliation

Clockwork Research, 21 Southwick Mews, London W2 1JG, United Kingdom.

Copyright

(Copyright © 2012, Elsevier Publishing)

DOI

10.1016/j.aap.2011.09.021

PMID

22239927

Abstract

This study provides a practical example of fatigue risk management in aviation. The sleep and sleepiness of 44 pilots (11 trips×4 pilot crew) working an ultra long-range (ULR; flight time >16h) round-trip operation between Doha and Houston was assessed. Sleep was assessed using activity monitors and self-reported sleep diaries. Mean Karolinska Sleepiness Scores (KSS) for climb and descent did not exceed 5 ("neither alert nor sleepy"). Mean daily sleep duration was maintained above 6.3h throughout the operation. During in-flight rest periods, 98% of pilots obtained sleep and sleepiness was subsequently reduced. On layover (49.5h) crew were advised to sleep on Doha or Universal Co-ordinated Time (UTC), but 64% slept during the local (social) night time. Pilots originating from regions with a siesta culture were more likely to nap and made particularly effective use of their daytime in-flight rest periods. The results indicate that the operation is well designed from a fatigue management perspective.

Language: en