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.
L’altitude minimale de secteur (MSA) est l’altitude la plus basse qui fournit au moins 1 000 pieds de franchissement au-dessus de tous les obstacles dans une zone définie, typiquement un secteur de 25 milles nautiques de rayon centré sur une aide à la navigation ou un repère proéminent associé à une procédure d’approche. Les MSA sont divisées en secteurs de compas (habituellement quatre quadrants), et chaque secteur a sa propre valeur d’altitude selon le terrain dans cette portion du cercle. La MSA est publiée sur les cartes d’approche aux instruments comme le “cercle MSA” dans la vue en plan, et son objectif est de fournir une altitude de référence de sécurité d’urgence en cas d’incertitude de navigation, de panne de communications ou d’un besoin inattendu de manoeuvrer dans la zone terminale.La MSA est une référence d’altitude de sécurité d’urgence, pas une altitude d’exploitation régulièrement utilisée. Elle ne garantit pas la réception des aides à la navigation et ne remplace pas les altitudes de procédure publiées ou les clairances ATC. Lorsqu’un équipage est incertain de sa position ou a perdu les communications, descendre à ou maintenir l’altitude MSA du secteur applicable fournit un niveau de base de franchissement des obstacles pendant que la situation est résolue. Dans certaines circonstances, la MSA peut être la seule référence disponible si les systèmes de navigation principaux ont échoué et que l’équipage doit déterminer une altitude de maintien sûre près de la destination.
Dans les opérations de la compagnie aérienne virtuelle
Le cercle MSA sur les cartes d’approche est une référence utile pour les équipages de Virtual Air Canada Airline volant vers des aéroports non familiers, particulièrement ceux entourés de terrain. Vérifier la MSA avant de commencer une descente assure que toute altitude de manoeuvre utilisée durant les vecteurs ou les attentes inattendues fournira une séparation adéquate par rapport au terrain. En simulation, consulter la MSA ajoute de la discipline procédurale aux briefings d’approche et reflète la pratique du monde réel pour les destinations montagneuses comme celles trouvées sur les routes canadiennes et internationales.
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