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TM 11 5820 890 20 2
B 2
B.2. MAINTENANCE FUNCTIONS. Continued
i. 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.
j. 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 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 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. 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 detailed explanation of these functions, see paragraph 2.)
d. Column 4, Maintenance Level. Column 4 specifies the level of maintenance authorized to perform the
function listed in Column 3 by listing a work time figure in the appropriate subcolumn(s). This 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 will be 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), 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 levels are as follows:
C
Operator or crew
. . . . . . . . . . . . . . . . . . .
O
Unit Maintenance
. . . . . . . . . . . . . . . . . . .
F
Direct Support Maintenance
. . . . . . . . . . . . . . . . . . .
H
General Support Maintenance
. . . . . . . . . . . . . . . . . . .
D
Depot Maintenance
. . . . . . . . . . . . . . . . . . .
_______
1
Services inspect, test, service, adjust, aline, calibrate, and/or replace.
2
Fault locate/troubleshoot the process of investigating and detecting the cause of equipment malfunction; 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 level of maintenance under consideration.
4
Actions welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.
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