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TM 10-4930-240-13
B-2. MAINTENANCE FUNCTIONS-cont
g.
Remove/Install. To remove and install the same item when required to perform service or other
maintenance functions Install may be the act of emplacing, seating, or fixing into position a spare,
repair part, or module (component or assembly) in a manner to allow the proper functioning of an
equipment or system.
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 3rd position code of the SMR code.
i.
Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, and disassembly/assembly procedures, and maintenance actions 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 (1 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 material 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 numbers are "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 a detailed explanation of these functions, see paragraph B-2).
d. Column 4, Maintenance Level. Column 4 specifies, by the listing of a work time figure (expressed as
man-hours shown as whole hours or decimals) in the appropriate subcolumn(s), the level of
maintenance authorized to perform the function listed m Column (3). This figure represents the active
time required to perform that maintenance function at the indicated level of maintenance. If the
number or the complexity of the tasks within the listed maintenance function vary at different
maintenance levels, appropriate work time figures will be shown for each level. 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 item 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
B-2
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