Section VIII Pinholes Open to Surface - Criteria. Section VIII Pinholes Open to Surface - Criteria. Researching acceptance criteria for pinholes and elongated indications open to the surface. The item in question meets acceptance standards for Appendix 6 for MT and Appendix 8 for LPT that can be open to the surface. UW-38 address repair of defects and states pinholes open to the surface shall be removed.