TM 9-2320-273-20
B-2. MAINTENANCE FUNCTIONS (Continued).
i. Repair. The application of maintenance services1 or other maintenance actions2 to repair service-
ability to an item by correcting specific damage, fault, malfunction, or failure in a part, subassembly, mod-
ule (component or assembly), and item, or system.
j. Overhaul. That maintenance effort (services/actions) necessary to restore an item to a completely
serviceable/operational condition as prescribed by maintenance standards (i.e., DMWR) in appropriate
technical publications. 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 equip-
ment 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 equipments/
components.
B-3. COLUMN ENTRIES USED IN THE MAC.
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify
components, assemblies, subassemblies, and modules with the next higher assembly.
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 Functions. 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 Level. Column 4 specifies, by the listing of a “work time” figure in the
appropriate sub-column(s), the lowest level of maintenance authorized to perform the function listed in
column 3. This figure represents the active time required to perform the maintenance function at the
indicated level of maintenance. If the number or complexity of the tasks within the listed maintenance
function varies at different maintenance levels, appropriate “work time” figures will be shown for each
level. The number of manhours specified by the “work time” figure represents the average time required
to restore an item (assembly, subassembly, component, module, end item, or system) to a serviceable con-
dition under typical field operating conditions. This time includes preparation time, troubleshooting 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 -
C –
O
F –
H –
D –
for the various maintenance levels are as follows:
Operator or crew
Organizational maintenance
Direct Support maintenance
General Support maintenance
Depot maintenance
e. Column 5, Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individ-
ual tools) and special tools, test, and support equipment required to perform the designated function.
1Services – Inspect, test, service, adjust, a line, calibrate, or replace.
2Action
– Welding, grinding, riveting, straightening, facing, remachining, or resurfacing.
B-2
