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.
Un groupe de puissance au sol (GPU) est une source d’alimentation électrique externe utilisée pour fournir du courant alternatif (AC) ou continu (DC) à un aéronef lorsqu’il est au sol. Les GPU sont connectés à l’aéronef par une prise de puissance au sol normalisée, typiquement située près du train avant ou sur le fuselage inférieur. En utilisant l’alimentation GPU, l’aéronef peut faire fonctionner ses avioniques, éclairage, climatisation et autres systèmes électriques sans consommer de carburant du APU (Auxiliary Power Unit) ni drainer les batteries de l’aéronef. Cela réduit la consommation de carburant, diminue les émissions sur l’aire de trafic, prolonge la durée de vie de l’APU et réduit les niveaux de bruit dans les zones de porte.Les GPU se présentent sous plusieurs formes. Les systèmes fixes intégrés aux portes sont installés dans les passerelles des aéroports achalandés et fournissent l’alimentation directement par un câble. Les GPU mobiles sont des unités autonomes diesel ou électriques qui peuvent être conduites à n’importe quel poste de stationnement. Les aéroports et compagnies aériennes modernes utilisent de plus en plus des GPU électriques dans le cadre de programmes de durabilité, éliminant les émissions diesel locales sur l’aire de trafic. Avant de connecter l’alimentation externe, les équipes au sol vérifient que la tension et la fréquence de sortie du GPU correspondent aux exigences de l’aéronef - les aéronefs commerciaux à réaction nécessitent typiquement 115V AC à 400Hz. Le panneau d’alimentation externe du poste de pilotage permet aux pilotes de sélectionner l’alimentation GPU et de vérifier sa qualité avant de l’appliquer aux bus de l’aéronef.
Dans les opérations de la compagnie aérienne virtuelle
De nombreux modules haute fidélité modélisent les connexions GPU dans le cadre de la procédure de démarrage à froid. Dans des aéronefs comme le FlyByWire A32NX ou le PMDG 737, connecter l’alimentation externe avant le démarrage de l’APU est une étape réaliste et recommandée lors du départ d’une porte. Certains modules de services au sol (comme GSX) simulent les connexions GPU visuellement sur l’aire de trafic, ajoutant du réalisme aux procédures prévol.
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