Non-normal
This euphemism appears to have replaced the supplementary procedures that complimented the normal, emergency and abnormal procedures in the AFM.
Various airlines appear to refer to them as conditional or additional procedures. Have seen one example where abnormal procedures were referred to as irregular procedures.
One can only assume that since these items were additional to the emergency/abnormal checklists and not covered in the Normal checklist then a good idea was to call them non-normal.
What in a name eh!!
