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TM 9-4120-389-14
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a. 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".
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c. Column 3, Maintenance Functions. 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).
d. Column 4, Maintenance Category, Column 4 specifies, by the listing of a work time figure in the
appropriate subcolumn(s), the category of maintenance authorized to perform the function listed in column 3.
This figure represents the active time required to perform that maintenance function at the indicated category
of maintenance. If the number or complexity of the tasks within the listed maintenance function vary at
different maintenance categories, appropriate work time figures will be shown for each category. The work time
figure represents the average time required to restore an item (assembly, subassembly, component, module,
end item, or system) to a serviceable condition under typical field operating conditions. This time includes
preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location time, and
quality assurance/quality control time in addition to the time required to perform the specific task identified for
the maintenance functions authorized in the maintenance allocation chart. The symbol designations for the
various maintenance categories are as follows:
C..................................................... Operator or Crew
O .................................................... Unit Maintenance
F ..................................................... Directional Support Maintenance
H..................................................... General Support Maintenance
D..................................................... Depot Maintenance
e. 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.
f. 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.
B-3
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