This International Standard specifies the testing conditions and the acceptance standard for ultrasonic acceptance tests for the components and types of tests covered in table 1, columns 1 to 6. Unless otherwise agreed, this International Standard shall be applied when the product standards require mandatory ultrasonic tests or when the ordered optional tests are made mandatory (see ISO 1005-1, ISO 1005-3 and ISO 1005-6). NOTE 1 Following the revision of ISO 1005-6, ultrasonic acceptance tests are mandatory for all wheels of testing category B, but optional for all wheels of testing category A. According to ISO 1005-1 and ISO 1005-3, ultrasonic acceptance tests on tyres and axles are optional in every case.