MRC:
The technical differentiating characteristic/s/ of an item of supply which depart/s/ from the text of a specification or a standard in that it represents a selection of characteristics stated in the specification or standard as being optional,or a variation from one or more of the stated characteristics,or an additional characteristic not stated in the specification or standard.ZZZW
Departure From Cited Document:
Per drawing this is a critical application item and is part of a system supporting the launch and/or recovery of aircraft and is essential to system performance or operation, or the perservation of life or safety of operating personnel.