TM54930-230-13
B-2. MAINTENANCE FUNCTIONS - Continued
g. Install. The act of emplacing, seating, or fixing into position an item, part, or module (compo-
nent or assembly) in a manner to allow the proper functioning of an equipment or system.
h. Replace. The act of substituting a serviceable like type part, subassembly, or module (compo-
nent or assembly) for an unserviceable counterpart.
i. Repair.
The application of maintenance servicesl or other maintenance actions2 to restore ser-
viceability 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 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 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 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 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 C-2.)
d. Column 4, Maintenance Category.
Column 4 specifies, by the listing of a work time figure in the
appropriate subcolumn(s), the category of maintenance authorized to perform the function listed in Col-
umn 3. This figure represents the active time required to perform that maintenance function at the in-
dicated 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
1Services - inspect, test, service, adjust, align, calibrate, or replace.
2Actions - welding, grinding, riveting, straightening, facing, remachining, or resurfacing.
B-2
