Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of an equipment or system.
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 Source, Maintenance, and Recoverability (SMR) code.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/installation, and
disassembly/assembly procedures, and maintenance actions 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),
end item, or system.
Overhaul. The maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operations 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.
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 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.
EXPLANATION OF COLUMNS IN THE MAC, TABLE 1
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 listed as 00.
Column 2, Component/Assembly. Column 2 contains the names of the components, assemblies, subassemblies,
and modules for which maintenance is authorized.
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 the Maintenance Functions information detailed above.
Column 4, Maintenance Level. Column 4 specifies, by the listing of work-time in the appropriate sub column(s), the
level 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 level of maintenance. If the number of 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 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
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
Column 5, Tools and Equipment. Column 5 specifies by code, those common tool sets (not individual tools) and
special tools (Test, Measurement, and Diagnostic Equipment (TMDE)), and support equipment required to perform the
Column 6, Remarks. This column shall, when applicable, contain a letter code, in alphabetical order, which shall be
keyed to remarks contained in Table 3.