h. Replace. Substitution of a serviceable like-type part, subassembly, or
module (component or assembly) for an unserviceable counterpart.
i. Repair. Application of maintenance services (inspect, test, service, adjust,
aline, calibrate, replace) or other maintenance actions (welding, grinding,
riveting, straightening, facing, remachining, or resurfacing) to restore
serviceability to an item by correcting specific damage, fault, malfunction, or
failure in a part, subassembly, module/component/assembly, and item or system.
This function does not include trial and error replacement of consumable spare type
items such as fuses, lamps, or electronic tubes.
j. Overhaul. Periodic maintenance effort (service/action) necessary to restore
an item to a completely serviceable/operational condition as prescribed by
maintenance standards (e.g., 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. 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 (hour, miles, etc.) considered in
classifying Army equipment/components.
B-3. EXPLANATION OF MAC COLUMN ENTRIES.
This column lists group numbers, the purpose of which is to
identify components, assemblies, subassemblies and modules with the next highest
b. Component/Assembly. This column contains the noun names of components,
assemblies, subassemblies, and modules for which maintenance is authorized.
c. Maintenance Function. This column lists the functions to be performed on the
item listed in the Component/Assembly column.
d. Maintenance Category. This column specifies, by the listing of a "worktime"
figure in the appropriate subcolumn(s), the lowest level of maintenance authorized
to perform the function listed in the Maintenance Function column. 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 varies at different maintenance categories,
appropriate "worktime" figures will be shown for each category. The number of
man-hours specified by the "worktime" 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
control time in addition to the time required to perform the specific tasks
identified for the maintenance functions authorized in the MAC.