TM 10-6630 245-13&P
Repair. The application of maintenance services including fault location/troubleshooting, removal, installation
and disassembly, assembly procedures and maintenance actions to identify troubles and 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 (service/action) prescribed to restore an item to a completely
serviceable/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.
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 supplied to Army equipment. The rebuild operation includes the act of returning to zero those age
measurements (e.g., hours/miles) considered in classifying Army equipment/components.
B.3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
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.
Column 2, Component/Assembly. Column 2 contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column 3, Maintenance Function. Column 3 lists the function 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 each level of maintenance authorized to perform each
function listed in Column 3, by indicating work time required (expressed as Man hours in whole hours or
decimals) in the appropriate subcolumn. This work time figure represents the active time required to perform
that 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 are shown for
each level. 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), trouble
shooting/fault location time, and quality assurance 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:
C.......... Operator or crew maintenance
O ......... Unit maintenance
F .......... Direct support maintenance
L .......... Specialized Repair Activity (SRA)
H.......... General support maintenance
D.......... Depot maintenance
Column 5, Tools and Test Equipment Reference Code. Column 5 specifies, by code, those common tool
sets (not individual tools), common TMDE, and special tools, special TMDE, and special support equipment
required to perform the designated function. Codes are keyed to tools and test equipment in Section III.
Column 6, Remarks. When applicable, this column contains a letter code, in alphabetical order, which is keyed
to the remarks contained in Section IV.
B.4. EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, SECTION III.
Column 1, Reference Code. The tool and test equipment reference code correlates with a code used in the
MAC, Section II, Column 5.
Column 2, Maintenance Level. The lowest level of maintenance authorized to use the tool or test equipment.