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 température extérieure (OAT) est la température ambiante de l’air entourant l’aéronef, mesurée par des capteurs montés sur le fuselage à l’écart des sources de chaleur. Sur les aéronefs de catégorie transport, l’OAT est affichée sur le poste de pilotage dans le cadre du système de données aérodynamiques et est référencée durant les calculs de performance à chaque phase de vol. En atmosphère standard, l’OAT diminue d’environ 2°C par 1 000 pieds d’altitude jusqu’à la tropopause, au-dessus de laquelle elle reste approximativement constante.L’OAT influence directement la poussée des moteurs, la consommation de carburant, la performance de l’aéronef et le risque de givrage. Une OAT élevée au départ réduit la densité de l’air, ce qui diminue la poussée moteur disponible et augmente les distances de décollage - nécessitant des corrections de performance aux V-speeds et aux réglages de poussée. Inversement, les températures froides améliorent l’altitude-densité et la performance moteur mais introduisent des risques d’accumulation de givre sur les surfaces portantes et les entrées moteur. Les équipages utilisent l’OAT en conjonction avec l’écart ISA (la différence entre l’OAT réelle et la température de l’atmosphère standard) pour évaluer la performance en montée, les limites de Mach en croisière et la planification du carburant.
Dans les opérations de la compagnie aérienne virtuelle
Chez Virtual Air Canada Airline, l’OAT affecte les données de performance générées par SimBrief dans votre OFP. Les paramètres météo du simulateur reflétant des températures réalistes produiront des calculs précis de V-speeds et de poussée. Surveiller l’OAT durant la montée et la croisière aide les pilotes à comprendre les écarts par rapport à la consommation de carburant planifiée et confirme la logique appropriée d’antigivrage moteur lors des opérations par temps froid.
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