B-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 into 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 third position of the Source,
Maintenance, and Reliability (SMR) code.
i. Repair. The application of maintenance services1 including fault location/troubleshooting,2 removal installation,
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.
j. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceability/operational condition as required by maintenance standards in the appropriate technical
publications (i.e., Depot Maintenance Work Requirement [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 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 returning to zero those age
measurements (e.g., hours/miles) considered in classifying Army equipment/components.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
Column (1), Group No. Column 1 lists functional group code numbers, the purpose of which is to identify
components, assemblies, subassemblies, and modules with the next higher assembly.
b. Column (2), Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c. Column (3), Maintenance Functions. Column 3 lists the functions to be performed on the item listed in column
2 (for detailed explanation of these functions see para. B-2).
1lnspect, test, service, adjust, aline, calibrate, and/or replace.
2The process of investigating and detecting the cause of equipment malfunctioning; the act of isolating a fault within a
system or Unit Under Test (UUT).
3The 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 the level of maintenance under consideration (i.e., identified as maintenance significant).
4Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.