File:Cabin nose section of 747-8I prototype.jpg

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English: Nose section of the 747-8I prototype cabin.

The prominent black tanks store water which is shifted longitudinally (through the gray plumbing) in the aircraft during test flights. This allows precise control of the center of gravity position and measurement of the corresponding stability and control margins.

Also visible are the flight test pressure probe equipment, cabled with red wires and connected to dynamic pressure probes on the outside of the fuselage through specifically-replaced window panes (the right probes were disconnected at the time of the photo).
Français : Section avant de la cabine du prototype du Boeing 747-8I.

Les réservoirs noirs stockent de l’eau qui est déplacée longitudinalement au sein de l’avion (grâce à la tuyauterie grise) durant les vols d’essai. Cela permet un contrôle précis de la position du centre de gravité et la mesure des marges de stabilité et de contrôle correspondantes.

Deux équipements de mesure de la pression, câblés en rouge, sont également visibles. Ils sont reliés aux sondes de pression dynamique à l’extérieur du fuselage au travers de hublots remplacés pour l’occasion (les sondes à droite étaient déconnectées au moment où la photo a été prise).
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Author Olivier Cleynen

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