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TM 10-3930-669-20
B-2. MAINTENANCE FUNCTIONS (CONT).
h.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and is shown as the 3d position code of the SMR code.
i.
Repair. The application of maintenance services 1, including fault location/troubleshooting 2,
removal/installation, and disassembly/assembly 3 procedures, and maintenance actions 4 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/operational 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, sub-assemblies, and modules with the next higher assembly.
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 subcolumns(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 tasks identified for the maintenance functions authorized in the maintenance
allocation chart. The symbol designations for the various maintenance categories are as follows:
1Services inspect, test. service, adjust. aline, calibrate, and/or replace
2Fault locate/troubleshooting The process of investigating and detecting the cause of equipment malfunctioning; the act
of isolating a fault within a system or unit under test (UUT).
3Disassemble/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 a. maintenance significant (i.e assigned an SMR code) for the
category of maintenance under consideration
4
Actions welding, grinding, riveting, straightening, facing, remachine, and/or resurfacing.
B-2
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