Repair. The application of maintenance services or other maintenance actions 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 (service/action) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards in appropriate technical publications,
i.e., Depot Maintenance Work Requirement ()MWR). Overhaul is normally the highest degree of maintenance
performed by the Army. 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 materiel
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 equipments/components.
B.4 EXPLANATION OF COLUMNS IN THE MAC, SECTION II .
Functional Groups (Columns I and 2). The functional groupings shown in the sample below identify maintenance
significant components and assemblies.
LRU-18/U Life Raft
Maintenance Function (Column 3). Column 3 lists the functions to be performed on the items listed in column 2.
Maintenance Level (Column 4). The maintenance levels AVUM, AVIM, and DEPOT are listed on the
Maintenance Allocation Chart with individual columns that include 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 level to perform a specified maintenance function. In this case, "0.1" indicates one-tenth of and
hour, not one minute. If a work time has not been established, the columnar presentation shall indicate"____"
Maintenance levels higher than the level of maintenance indicated are authorized to perform the indicated
Tools and Test Equipment Reference Code (Column 5 and Section III). Common tool sets (not individual tools),
special tools, and test and support equipment required to perform maintenance functions are listed alphabetically
in Section III with a reference number to permit cross-referencing to column 5 in the MAC. In addition, the
maintenance category authorized to use the device is listed along with the item National Stock Number (NSN)
and, if applicable, the tool number to aid in identifying the tool/device.
Remarks Code (Column 6 and Section IV). Remarks (identified by an alphabetical code in column 6) and other
notes (identified by a number in parentheses in the applicable column) are listed in Section IV to provide a ready
reference to the remark/note.