Ce glossaire est rédigé pour une utilisation dans le cadre d’une compagnie aérienne virtuelle et de la simulation de vol au sein de Virtual Air Canada Airline. Il ne constitue pas une référence en aviation réelle.
La fenêtre de creux circadien (WOCL) est la période du cycle circadien de 24 heures durant laquelle le corps humain connaît ses niveaux les plus bas de vigilance, de performance cognitive et de disponibilité physique. Pour la plupart des personnes suivant un cycle veille-sommeil normal, le WOCL se situe approximativement entre 02 h 00 et 06 h 00 heure locale. Durant cette fenêtre, la température corporelle centrale est à son minimum quotidien, les niveaux de mélatonine sont encore élevés, et le temps de réaction et la capacité de prise de décision sont mesurément dégradés. Ces effets surviennent indépendamment de si la personne se sent subjectivement fatiguée, rendant le WOCL particulièrement dangereux du point de vue de la sécurité.En aviation, le WOCL est un concept central dans la gestion du risque de fatigue. Les cadres réglementaires tels que l’EASA Subpart FTL et le FAR Part 117 imposent des restrictions sur les vols programmés à travers le WOCL, incluant des périodes de service de vol maximales réduites, des exigences de présentation plus tôt et des dispositions de repos obligatoires. Les compagnies aériennes opérant des routes long-courriers de nuit transitant par le WOCL augmentent typiquement leur effectif d’équipage pour permettre le repos en vol dans des installations de repos d’équipage supplémentaires. Le repos contrôlé sur le poste de pilotage - un court sommeil structuré pris par un pilote tandis que l’autre maintient la veille - est également approuvé selon certaines procédures d’exploitant comme mesure d’atténuation de la fatigue du WOCL. Les données de vol et l’analyse des incidents montrent de manière constante des taux d’erreur accrus et une performance réduite durant les opérations affectées par le WOCL.
Dans les opérations de la compagnie aérienne virtuelle
Bien que les pilotes virtuels ne soient pas soumis aux mêmes restrictions réglementaires de fatigue que les vrais équipages, la conscience du WOCL reste pertinente. Voler de longues sessions virtuelles - particulièrement la nuit - peut reproduire la dégradation de la vigilance des vraies périodes WOCL, augmentant la probabilité d’erreurs, d’annonces manquées ou de mauvaises décisions. Les pilotes virtuels VACA sont encouragés à voler lorsqu’ils sont alertes et à prendre des pauses durant les longues sessions, reproduisant les principes de bonne gestion de la fatigue qui sous-tendent la culture de sécurité de l’aviation professionnelle.
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