Could you clarify the where "Dcum avi" is used?

: Is this part of a phrase in a language other than English?

The phrase does not appear to be a standard term, abbreviation, or widely recognized concept in major fields like aviation, law, medicine, or technology.

: Is this related to a specific internal company project, a niche software, or a local regulation?

If you can share or what it’s related to , I can draft the specific write-up you need.

: Could you mean "Docum AVI" (referring to a video file documentation) or "Ducum" (Latin for "leader")?