This Aerospace Standard establishes an identification system and provides design and tolerance information in describing two series of image quality indicators currently used in radiography of aerospace components, especially in electronic component evaluation and radiographic film and paper classification. Individual image quality indicators (IQIs) are classified by use of this standard number, followed by appropriate codes. Synopsis of the classification system is: AS 1613-A-XX IQI, with six tungsten wires; and AS 1613-B-XX IQI, with six tungsten wires and six lead beads.