ARMY TM 9-6115-670-14&P
B-2
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.
i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate,
replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, re-
machining, or resurfacing) to 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) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in
appropriate technical publications. 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 components, assemblies, subassemblies, and modules within 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.
d. Column 4, Maintenance Level. Column 4 specifies, by the listing of a work time figure in the
appropriate subcolumn(s), the lowest level of maintenance authorized to perform the functions
listed in column 3. This figure represents the active time required to perform that maintenance
function at the indicated level of maintenance. If the number or complexity of 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
time, including 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 function authorized in the Maintenance Allocation Chart
(MAC). The symbol designations for the various maintenance levels are as follows:
C ................................................... Operator/Crew (Unit Level Maintenance)
O ................................................... Organizational (Unit Level Maintenance)
F.................................................... Direct Support
H ................................................... General Support
D ................................................... Depot
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.
