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 of system.
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC.
i. Repair. The application of maintenance services, including fault location troubleshooting2, removal/installation,
and disassembly/assembly , 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 function, or
failure in a part, subassembly, module (component or assembly) end item, or system.
The 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 to 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 material
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.
B-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.
End item group numbers shall be "00".
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
Services - inspect, test, service, adjust, align, calibrate, and/or replace.
Fault locate/troubleshoot - 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).
Disassemble/assemble - encompasses the step-by-step taking apart (or breakdown) of a spare/functional group
the category of maintenance under consideration.
Actions - welding, grinding, riveting, straightening, facing remachinery, and/or resurfacing.