MAINTENANCE FUNCTIONS - continued.
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.
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. That maintenance effort (service/action) prescribed to restore an item to a completely ser-
viceable/operat ional condition as required by maintenance standards in appropriate technical publica-
tions (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.
Rebulid. Consists of those service/actions necessary for the restoration of unserviceable equipment
to a like new condition in accordance with original manufacturing standards. Rebuild is the highest de-
gree of material maintenance applied to Army equipment. The rebuild operation includes the act of
returning to zero those age measurements (hour/miles, etc.) considered in classifying Army equip-
EXPLANATION OF COLUMNS IN THE MAC - SECTION II.
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 numbers are 00.
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, sub-
assemblies, 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 a detailed explanation of these functions, see paragraph B-2).
Column 4, Maintenance Level. Column 4 specifies, by the listing of a work time figure (expressed as
man-hours shown as whole hours or decimals) in the appropriate subcolumn(s), the level of mainte-
nance 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 or
the 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 item
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 system designa-
tions for the various maintenance levels are shown on the following page.
Operator or crew
Direct Support Maintenance
General Support Maintenance
Column 5. Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individual
tools) common TMDE, and special tools, special TMDE, and support equipment required to perform
the designated function.
Column 6. Remarks
. This column, when applicable, contains a letter code, in alphabetic order, which
is keyed to the remarks contained in Section IV.