2. MAINTENANCE FUNCTIONS - Continued
g. 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 onto position a
spare, repair part, or module (component or assembly) in a manner to allow the proper
functioning of an equipment or system.
h. 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 3rd
position code of the SMR code.
Repair. The application of maintenance services1 including fault location/troubleshooting2,
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
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a
completely serviceable/operational condition as required by maintenance standards in the
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
k. Rebuild. Consists
of those services/actions necessary for the restoration
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 (e.g., hours/miles) considered in
classifying Army equipment/components.
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.
b. Column (2) - Component/Assembly. Column 2 contains the item 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).
Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting - The process of investigating and detecting the cause of equipment
malfunctioning; the act of isolating a fault within a system or unit under test (UUT).
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/function group coded item
to the level of its least component, that is assigned an SMR code for the level of maintenance under
consideration (i.e., identified as maintenance significant).
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.