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This standard specifies the general tolerances of: Extruded section in aluminium alloys for aerospace applications. It applies: - to sections, standardized or defined by a drawing, the cross section of which, regular or irregular, can be inscribed in a circle of 250 mm (see figure 1), - to semi-hollow sections, the dimensional limits of which are indicated in figures 2 and 3. For sections with higher dimensions or of more complex forms, the tolerances shall be subject to agreement between the manufacturer and purchaser.