TM 9-4120-385-14
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g. Install. The act of emplacing, seating, or fixing into position an item, part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or
system.
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h. Replace. The act of substituting a serviceable like type part, subassembly, or module
(component or assembly) for an unserviceable counterpart.
i.
Repair. The application of maintenance services (inspect, test, service, adjust, align,
calibrate, or replace) and 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 or assembly),
end item, or system.
Overhaul. That maintenance effort (services/actions) necessary to restore an item to a
j.
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.
B3. COLUMN ENTRIES USED IN THE MAC
a. Column 1. Group Number. Column 1 lists group numbers, the purpose of which is to
identify components, 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 Functions. 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).
B-2
