Give NASM 33540 a try.
Many folks write their own internal doc.It can allways get intresting when there is a differance of opinion on what is the "right" criteria to use. The approved design data allways wins so for us our TSO data is the law.
Does anyone have the NASM33540 standard in pdf format? I would appreciate if you can attach it here or contact me.
Thank you.
Try to google FAA advisory circular AC 43.13-1B Chapter 7. The complete hard-copy volume "Acceptable methods, techniques, and practices — aircraft inspection and repair". Individual chapters are usually available for download.