Fibrous blank with at least one disconnection having an alternation of weaving

A fibrous blank produced in a single piece by three-dimensional weaving between a plurality of warp yarns extending in a longitudinal direction and a plurality of weft yarns extending in a transverse direction, the blank comprising at least one first disconnection extending in the longitudinal direction, the first disconnection extending from a first longitudinal edge of the fibrous blank and separating first and second woven portions in the blank, the blank further comprising a main woven portion without disconnection and located in an extension of the first and second woven portions in the longitudinal direction,

• wherein the fibrous blank has a first weaving plane in which at least a portion of the warp yarns of the first and second woven portions cross in the main woven portion in a crossing area adjacent to the first disconnection, and a second weaving plane different from the first weaving plane in which the warp yarns of the first and second woven portions do not cross in an area adjacent to the first disconnection, and wherein the fibrous blank has an alternation between the first and second weaving planes in the transverse direction.