Method for manufacturing an aircraft window frame comprising seams offset from a visible surface, window frame obtained from this method and aircraft comprising at least one such window frame

A method for manufacturing an aircraft window frame, said frame comprising a first surface that has at least first and second faces extending about an entire perimeter of the aircraft window frame, said first and second faces being joined by a curved joining zone, said frame being made of a composite material comprising fibers embedded in a resin matrix, the manufacturing method comprising:

• a step of assembling into an assembly, a reinforcement and a stack comprising a first layer positioned on the first surface and internal fiber layers, into a mold,
• a step of consolidating or polymerizing the assembly, and
• a step of demolding the aircraft window frame, the reinforcement having first and second peripheral edges, being interposed between the first layer on one side and the internal fiber layers on the other side, and being positioned in the joining zone, the first layer and the internal fiber layers extending on both sides of the reinforcement and being stacked on both sides of the reinforcement,
• wherein during the step of assembling, at least a first seam is made to join at least the reinforcement and some fiber layers, the first seam comprising stitches offset, in a direction perpendicular to the first surface, in relation to the first surface at least in the first face and in the joining zone so that the stitches do not reach the first surface and are not visible from the first surface.