The following comment was posted on another discussion and I thought it would be best in its' own discussion.
"I frequently find examples where an AD requires compliance with a specific revision of an SB and that SB may have been revised several times since the AD was issued. Many times it is difficult to locate the version of the SB that the AD requires compliance with. Many times the most current version of the SB conflicts with the one that the AD specified, yet many fall for the "most current is bestest" fallacy. There is a lot of misunderstanding regarding this in the industry." Anyoneofus