Fuel line in an aircraft

An aircraft, comprising:

• a fuselage;
• an aerodynamic lift system;
• a propulsion drive system;
• and
• a fuel tank system,
• wherein the fuel tank system has at least two refueling cells connected with a line, wherein the line has at least one line segment for connecting at least three lines, the line segment comprising
• a wall structure forming a continuous cavity, wherein the wall structure has at least three adapter openings configured to connect the continuous cavity with one line respectively, and wherein the wall structure consists of two half-shells, each half-shell defining a continuous, one-piece structure that includes an inner wall, an outer wall, and a rib that permanently fixes the inner wall to the outer wall, such that an intermediate cavity is formed between the inner wall and the outer wall, the inner wall defining the continuous cavity within which contents of the line segment flow through.

A method for the production of a line segment of a fuel line in an aircraft for connecting at least three lines with at least three adapters, the method comprising the steps:

• a) configuring a first half-shell of in such a way that an intermediate cavity is formed between a first inner and a first outer wall of the first half-shell to form a wall structure, wherein the inner wall defines a continuous cavity within which contents of the line segment flow through, and wherein the wall structure has at least three adapter openings for connecting the continuous cavity with respectively one line;
• b) configuring a second half-shell in such a way that an intermediate cavity is formed between a second inner and a second outer wall of the second half-shell, wherein the intermediate cavity surrounds the continuous cavity;
• c) connecting the first half-shell with the second half-shell;
• and
• d) connecting the first and second outer wall with adapter flanges, one of which is provided at each connection opening, wherein the connection is configured such that each of the first and second outer wall is respectively connected with the first and second inner wall via the connection flange, wherein
• the first half-shell is a continuous, one-piece structure that includes the first inner wall, the second wall, and a reinforcement rib that permanently fixes the first inner wall to the first outer wall.