This standard defines the general principles required for the ultrasonic examination of industrial products that permit the transmission of ultrasound. The specific conditions of application and use of ultrasonic examination, which depend on the type of product examined, are described in documents which could include: - product standards; - specifications; - codes; - contractual documents; - written procedures. Unless otherwise specified in the referencing documents the minimum requirements of this standard are applicable. This standard does not define: - extent of examination and scanning plans; - acceptance criteria.