An owner/operator saying "but SL's are not mandatory"
It is not what the Name of the Document is - It is the actual content that needs attention or the required Maintenance etc. This SB and SL myth has been perpetuated for a long time. Look how McCauley have updated some of their older Prop. Manuals over the years, e.g. through the use of SLs.
Ya all take heed out there.