TM 5-3610-256-14
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place.
“Replace” is authorized by the MAC and is shown as the 3rd position code of the SMR code.
i. Repair. The application of maintenance services1, including fault location/troubleshooting2,
removal/installation, and disassembly /assembles procedures, and maintenance actions4to 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 equip-
ment 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 Il.
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, sub-
assemblies, 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 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 per-form 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 dis-
assembly/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 Services. Inspect, test, service, adjust, aline, calibrate, and/or replace.
2 Fault locate/troubleshoot. The process of investigating and detecting the cause of equipment mal-
functioning; 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
