TM 5-4310-375-14
and disassembly/assembly3 procedures, and maintenance actions4 to identify troubles and restore serviceability to an item by
correcting specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item,
or system.
j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely serviceable/opera-
tional condition as required by maintenance standards in appropriate technical publications (i.e., DMWR). Overhaul is
normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like new
condition.
k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a like new
condition in accordance with original manufacturing standards. Rebuild is the highest degree of materiel maintenance applied
to Army equipment. The rebuild operation includes the act of returning to zero those age measurements (hours/miles, etc.)
considered in classifying Army equipment/components.
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 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.)
d. Column 4, Maintenance Category. Column 4 specifies, by the listing of a work time figure in the appropriate sub-
column(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 com-
plexity 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 (assem-
bly, 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 tasks
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 . . . . . . . . . . . . . . . . . . . . . . . Organizational 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, TM DE, and support equipment required to perform the designated function.
3
Disassemble/assemble - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded
item to the level of its least componency identified as maintenance significant (i.e., assigned an SMR code) for the category of
maintenance under consideration.
4
Actions - welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing.
B-2
