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.
Le nombre de Mach maximal d’exploitation (MMo) est le nombre de Mach le plus élevé auquel un aéronef est certifié pour opérer, représentant une limite de vitesse supérieure définie dans le manuel de vol de l’aéronef. Le MMo s’applique aux altitudes où le nombre de Mach plutôt que la vitesse indiquée devient le facteur limitant - typiquement au-dessus de l’altitude de croisement où l’aéronef atteindrait VMo (vitesse indiquée maximale d’exploitation) et MMo simultanément. Dépasser le MMo risque d’entrer dans la zone des effets de compressibilité, incluant le Mach tuck, le buffet de commande et une efficacité de contrôle réduite causée par la formation d’ondes de choc sur l’aile et les surfaces de contrôle.Les aéronefs de transport sont conçus avec une marge entre le MMo et la vitesse à laquelle les caractéristiques de maniabilité se dégradent significativement (connue sous le nom de vitesse de buffet MMo ou de départ en survitesse). Le système d’avertissement de survitesse de l’aéronef déclenchera des alertes auditives et visuelles si l’équipage laisse la vitesse dépasser le MMo, et le système d’automanette du pilote automatique empêche normalement l’aéronef d’atteindre cette limite en opération normale. Sur les aéronefs avec des systèmes de protection de l’enveloppe de vol, comme les types Airbus à commandes de vol électriques, des limites dures empêchent l’aéronef de dépasser le MMo sous contrôle informatique. Les valeurs MMo typiques pour les aéronefs de transport commercial courants vont de Mach 0,82 pour les monocouloirs à Mach 0,89 ou plus pour certains types gros-porteurs.
Dans les opérations de la compagnie aérienne virtuelle
Le MMo est un paramètre de performance pertinent pour les équipages de Virtual Air Canada Airline volant des segments de croisière à haute altitude. SimBrief calcule des profils de croisière qui restent dans les limites de vitesse certifiées, et le système de gestion de vitesse basé sur le cost index du FMS maintient l’aéronef sous le MMo durant les opérations normales. En simulation, les dépassements de survitesse involontaires - comme durant une descente rapide dans un air plus chaud sans réduction des gaz - peuvent être facilement déclenchés, et connaître la limite MMo de l’aéronef piloté permet aux équipages de répondre de manière appropriée.
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