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 TM 55-1905-223-2413
i Repair. The application of maintenance services' including fault location/trouble- shooting2, removal
/installation, and disassembly/assembly3 procedures, and maintenance ac- tions4 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), 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. Re- build 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 pur- pose 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
Service - Inspect, test, service, adjust, align, calibrate, and/or replace.
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).
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/function-
al 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).
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
Change 3
B-2
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