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 TM 55-1905-223-24-11
i Repair. The application of maintenance services1 including fault location/troubleshooting2, removal
installation, and disassembly/assembly3 procedures, and maintenance actions to identify troubles and restore
4
serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly,
module (component or assembly), and 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 in 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 service/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 and components.
B-3 EXPLANATION OF COLUMNS IN THE MAC, SECTION II
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.
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 detailed explanation of these functions, see paragraph A-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 varies 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 Unit Maintenance
F Direct Support Maintenance (DS)
H General Support Maintenance (GS)
D Depot Maintenance
1
Service - Inspect, test, service, adjust, align, calibrate, and/or replace.
2
Fault location/troubleshooting - 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
Disassemblylassembly - The step-by-step breakdown (taking apart) of a spare/functional group coded
item to the level of its least component, that is assigned an SMR code for the level of maintenance under
consideration (i.e., identification as maintenance significant).
4
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
Change 2 B-2
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