j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely ser-
viceable/operational condition as required by maintenance standards in appropriate technical publications
(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 equipment/components.
B-3. Explanation of Columns in the MAC, Section 11.
a. Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to
identify maintenance significant components, assemblies, subassemblies, and moduIes with the next higher
assembly. End item group number shall be "00".
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subassem-
blies and modules for which maintenance is authorized,
c. Column 3, Maintenance Function. 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.)
d. Column 4, Maintenance Level. Column 4 specifies by the listing of a work time figure in the appro-
priate subcolumn(s), the category of maintenance authorized to perform the function listed in Column 3.
This figure represents the active time required to perform that maintenance function at the indicated category
of maintenance. If the number or complexity of the tasks within the Iisted maintenance function vary at
different maintenance categories, appropriate work time figures will be shown for each category. The work
time figure represents the average time required to restore an item (assembly, subassembly, component, mod-
ule, end item, or system) to a serviceable condition under typical field operating conditions. This time includes
preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location 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 alIocation chart. The symbol designa-
tions for the various maintenance categories areas follows:
Operator or crew
Direct Support maintenance
General Support maintenance