Fuel tank for an aircraft

B - Operations – Transporting – 64 – D

Patent

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Details

B64D 37/02 (2006.01) B64D 37/32 (2006.01) B64D 45/02 (2006.01) B65D 90/46 (2006.01) H05F 3/02 (2006.01)

Patent

CA 2575899

Unsafe electric energies can exist in aircraft fuel tanks as a result of static build-up or induced currents from lightning strikes. The invention provides an aircraft having a ground circuit (19) and including a fuel tank (1) having a fuel probe circuit having its own ground circuit (18). Multiple discharge paths (18-26-19) allow the safe discharge of electricity from the tank (1) before it reaches levels where an arc, spark or other electric discharge, able to ignite fuel in the tank, could occur. The discharge paths all pass via a conductive foam (26) having a relatively high impedance that allow static bleed, but does not significantly increase the risk of currents induced by lightning reaching levels at which an ignition-causing electrical discharge might occur. The foam (26) is securely bonded to both the aircraft ground circuit (19) and the fuel probe ground (18), the bonds having a large area of surface-to-surface contact.

Cette invention concerne les dangers de l~énergie électrique dans les réservoirs de carburant d~aéronefs consécutive à une accumulation statique ou à des courants induits provenant des impacts de foudre. La présente invention concerne un aéronef disposant d'un circuit terrestre (19) et comprenant un réservoir de carburant (1) disposant d'un système de jauge de carburant disposant de son propre circuit de masse (18). De nombreuses voies de décharge (18-26-19) permettent une décharge sans danger de l~électricité à partir du réservoir (1) avant qu~elle n~atteigne des niveaux où un arc, un parc ou une autre décharge électrique peut enflammer le carburant à l~intérieur du réservoir. Les voies de décharge passent toutes par une mousse conductrice (26) disposant d~une impédance relativement élevée qui permet un prélèvement statique, mais n~augmente pas significativement le risque de courants induits avec un éclairage qui atteint des niveaux pouvant causer une décharge électrique qui peut causer l~allumage. La mousse (26) est solidement rattachée aussi bien au circuit de masse de l~aéronef (19) qu~à la connexion terrestre du carburant (18), les liens disposant d'une large zone de contact direct.

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