EXPLANATION OF COLUMNS IN THE MAC, SECTION II
Column 1, Group Number- Column 1 lists functional group code numbers, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher
assembly. End item group number shall be "00".
Column 2, Component/Assembly Column 2 contains the names of components assemblies, subassemblies,
and modules for which maintenance is authorized.
Column 3, Maintenance Function Column 3 lists the functions to be performed on the item listed in Column
2. (For detailed explanation of these functions, see paragraph B-2).
Column 4, Maintenance Category
(1) AVUM Aviation Unit Maintenance. AVUM activities will be staffed and equipped to perform high
frequency "On-Equipment" maintenance tasks required to retain or return equipment to a serviceable
(2) AVIM Aviation Intermediate Maintenance. AVIM provides mobile, responsive "onestop" maintenance
support. Authorized maintenance includes replacement and repair of module/components and end items
which can be accomplished efficiently with available skills, tools, and equipment. AVIM inspects,
troubleshoots, tests diagnoses, repairs, adjusts, calibrates, and aligns system modules and components.
Column 5, Tools and Equipment Column 5 specifies, by code, those common tool sets (not individual tools)
and special tools, TMDE, and support equipment required to perform the designated function.
Column 6, Remarks This column shall, when applicable, contain a letter code, in alphabetic order, which
shall be keyed to the remarks contained in Section IV.