What does O/I/D stand for?

O/I/D stands for Organizational/Intermediate/Depot maintenance levels

This definition appears very frequently

Samples in periodicals archive:

navair 01-1a-503 technical manual maintenance of aeronautical antifriction bearings for organizational, intermediate and depot maintenance levels: includes irac 3...

navair 01-1a-503 technical manual maintenance of aeronautical antifriction bearings for organizational, intermediate and depot maintenance levels...

Organizational, Intermediate, Depot Maintenance Levels; Wherever possible commercial software is used to develop training and technical manuals.