TM 9-4120-403-14
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 with the next higher assembly. End item group number shall be "00".
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 Direct 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
