This series includes materials concerning the education & training for commercial, military and general aviation aircrew, mechanics and ground crews, and other aviation-related personnel. Such material includes textbooks, technical works whose primary goal is the education or training of personnel (whether student or interested public), training course materials (student and instructor), training films, etc. Audiences can include neophytes, those seeking more knowledge, and the interested public.

Materials that are focused on research, development, testing and evaluation of aircraft and related powerplants will be in Series I.

Materials focused on aircraft design & construction and the aircraft industry will be in Series II. Similar materials related to aircraft engines will be in Series III. The audiences for these materials are primarily those who are already in aviation and/or are at least somewhat knowledgeable.

Technical materials related to the Maintenance, Repair & Overhaul (MRO) of aircraft and aircraft powerplants is in Series 4. This often includes detailed technical manuals and drawings.