j. Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely serviceable
operational condition as prescribed by maintenance standards (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 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. FUNCTIONAL GROUPS (Columns 1 and 2)
The functional groupings shown in the sample below identify maintenance significant components, assemblies,
subassemblies, and modules with the next higher assembly.
B-5. MAINTENANCE FUNCTION (Column 3)
Column 3 lists the functions to be performed on the items listed in column 2.
B-6. MAINTENANCE CATEGORIES AND WORK TIMES (Column 4)
The maintenance categories (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. 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 function.
Common tool sets (not individual tools), special tools, 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 (identified by an alphabetic 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 definition of the remark/note.