TM 10-6630-237-13&P
i. Repair.
The application of maintenance services, ’ including fault location/troubleshooting2 removal/installation,
and disassembly/assembly procedures3 and maintenance actions, 4 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.
j
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.
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 II.
a. Column I. 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/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
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 a 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:
1
Service, inspect, test, service, adjust, align, calibrate, and/or replace.
2
Fault locate/trouble shoot the process of investigating and detecting the cause of equipment malfunctioning; the act of
isolating a fault within a system or unit under test (UUT).
3
Disassemble/assemble encompasses the step-by-step taking apart (or breakdown) of a spare/functional group coded
item to the level of its least componency identified as maintenance significant (i.e., assigned an SMR code) for the
category of maintenance under consideration.
4
Actions welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.
B-2
