TM 11-7025-221-20
B-2. Maintenance Functions - Continued.
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 MAC, Section Il.
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 modules with the next higher
assembly. End item group number shall be "00."
b. Column 2, Component/Assernbly. Column 2 contains the names of components, assemblies, sub-
assemblies, 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 Category. Column 4 specifies, by the listing of a work time figure in the
appropriate 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 listed 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, module, 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 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 Equipment. Column 5 specifies, by code, those common tool sets (not individual
tools) and special tools, TMDE, and support equipment required to perform the designated function.
f. Column 6, Remarks. This column shall, when applicable, contain a letter code, in alphabetic order,
which shall be keyed to the remarks contained in Section IV.
B-4. Explanation of Columns in Tool and Test Equipment Requirements, Section Ill.
a. Column 7, Reference Code. The tool and test equipment reference code correlates with a code used
in the MAC, Section II, Column 5.
b. Column 2, Maintenance Category. The lowest category of maintenance authorized to use the tool
or test equipment.
c. Column 3, Nomenclature. Name or identification of the tool or test equipment.
d. Column 4, National Stock Number. The National stock number of the tool or test equipment.
e. Column 5, Too/ Number. The manufacturer's part number.
B-5. Explanation of Columns In Remarks, Section IV.
a. Column 7, Reference Code. The code recorded in column 6, Section Il.
b. Column 2, Remarks. This column lists information pertinent to the maintenance function being performed
as indicated in the MAC, Section Il.
B-2
