The invention relates to a method of manufacturing an aluminum alloy ingot using scrap aluminum alloy in the 2xxx or 7xxx series wherein (i) scrap aluminum alloy in the 2xxx or 7xxx series is procured; (ii) optionally, oil present on the scrap is separated, (iii) a first treatment operation of said scrap is made by a first liquid at a temperature of at least 10° C., said first liquid being an aqueous solution with pH equal to 1 to 5 or 8 to 13, (iv) the first liquid and the scrap thus treated are separated, (v) at least one second treatment operation of said scrap by a second liquid is made, (vi) the second liquid and the scrap thus treated are separated, (vii) said scrap thus obtained is melted, (viii) a first solidification is made in a rough intermediate form, (viii) an aluminum alloy ingot in the series of scrap used is cast; The invention also relates to a fabrication method after rolling, extrusion and/or forging of an aeronautical structure comprising the steps in the above method, and then at least one rolling, extrusion and/or forging step of said aluminum alloy ingot in the series of scrap used.