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.
Replace. The act of substituting a serviceable like part, subassembly, or module (component or
assembly) for an unserviceable counterpart.
Repair. The application of maintenance services or other maintenance actions to restore serviceabili-
ty 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 completely ser-
viceable/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 Ar-
my. Overhaul does not normally return an item to like-new condition.
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
EXPLANATION OF COLUMNS IN THE MAC, SECTION II
Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify com-
ponents, assemblies, subassemblies, and modules with the next higher assembly.
Column 2, Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
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 para. B-2.)
The maintenance categories (levels) AVUM, AVIM, and DEPOT are listed on the Maintenance Alloca-
tion Chart with individual columns that indicate the work times for maintenance functions at each
maintenance level, Work time presentations such as 0.1 indicate the average time it requires a
maintenance function. If a work time has not been established, the columnar presentation shall in-
dicate "-.-" Maintenance levels higher than the level of maintenance indicated are authorized to per-
form the indicated function.
Column 5, Tools and Equipment. Column 5 specifies, by code, those common tool sets (not in-
dividual tools) and special tools, TMDE, and support equipment required to perform the designated
Column 6, Remarks. This column shall, when applicable, contain a letter code, in alphabetical order,
which shall be keyed to the remarks contained in Section IV.