1.Technicians operate the first article according to the approved drawings.
2.Technicians inspect the first article and record. After inspected and approved, the first article will be put in the special box of first article, and wait for the workshop foreman recheck.
3. Workshop foreman proceed with the second inspection for the first article.
4. After the first article approved by technician and workshop foreman, and then start with mass production .
5. Inspection: All seal angles, small arc angles and diameters inspection by contracer, and all threads inspection by the right thread gages.