Remove/lnstall. To remove and install the same item when required to perform service or other
maintenance functions. Install may be the act of placing, 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 assigned maintenance level is shown as the 3d position code of the SMR code.
removal/installation, and disassembly/assembly3 procedures, and maintenance actions4, 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
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.
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 (e g., hours/miles) considered in classifying Army equipment/components.
1Services Inspect, test, service, adjust, align, calibrate, and/or replace.
2Fault location/troubleshooting The process of investigating and detecting the cause of equipment
malfunctioning; the act of isolating a fault with in a system or unit under test (UUT).
3Disassembly/assembly The step-by-step breakdown (taking apart) of a spare/functional group coded Item to
the level of its least component, that is assigned an SMR code for level of maintenance under consideration (i.e.,
identified as maintenance significant).
4Actions Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
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.
Column 2, Component/Assembly. Column 2 contains the item names of 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 paragraph B-2.).
Column 4, Maintenance Level. Column 4 specifies, by the listing of a work time figure in the appropriate
sub-column(s), the category 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 or
difficulty 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
conditions. This time includes preparation time (including any necessary disassembly/assembly time),