publications. 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
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 equipment/components.
B-3. COLUMN ENTRIES USED IN THE MAC.
a. Column 1, Group NumberColumn 1 lists group numbers, the purpose of which is to identify
components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column 2, Component/Assembly-Column 2 contains the name of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c. Column 3, Maintenance FunctionColumn 3 lists the functions to be performed on the item listed in
column 2. (For detailed explanation of these functions, refer to paragraph B-2.)
d. Column 4, Maintenance Level-Column 4 specifies, by the listing of a work time figure in the appropriate
subcolumn(s), the lowest level 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 the complexity of the tasks within the listed maintenance function vary at
different maintenance categories, appropriate work time figures will be shown for each level. The number of
manhours spectiled 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, 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 categories are as follows:
C Operator or Crew
O Organizational Maintenance
F Direct Support Maintenance
H General Support Maintenance
D Depot Maintenance
e. Column 5, Tools and EquipmentColumn 5 specifies, by code, those common tool sets (not individual
tools) and special tools, and support equipment required to perform the designated function.
f. Column 6, RemarksThis column shall contain a letter code, in alphabetic order, which shall be keyed to
the remarks contained in section IV.