Maintenance Functions (cont).
Replace. The act of substituting a serviceable like type part, subassembly, or module
(component or assembly) for an unserviceable counterpart.
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 (services/actions) necessary to restore an item to
a 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.
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 equipments/components.
Explanation of Columns in the MAC, Section II.
Column 1, Group Number. Column 1 lists group numbers, the purpose of which is
to identify components, 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 paragraph B-2.)
Column 4, Maintenance Level. Column 4 specifies, by the listing of a "work time"
figure in the appropriate sub-column(s), the lowest level of maintenance authorized to perform
the function listed in column 3. This figure represents the active time required to perform
the maintenance function at the indicated level of maintenance.
If the number or complexity
of the tasks within the listed maintenance function vary at different maintenance levels,
appropriate work time figures will be shown for each level. The number of man-hours
specified by 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 operating conditions.
This time includes preparation time, troubleshooting
time, and quality assurance/quality control time in addition to the time required to perform
the specific tasks identified for the maintenance functions authorized in the maintenance
allocation chart. The symbol designations for the various maintenance levels are as follows: