MAINTENANCE FUNCTIONS - Continued
h. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. Replace
is authorized by the MAC and shown as the 3rd position code of the SMR code.
Repair. The application of maintenance services1, including fault location/troubleshooting2, removal/
installation, and disassembly/assembly procedures3 and maintenance actions4to identify trouble and restore
serviceability to an item by correcting specific damage, fault, malfunction, or failure in a part.
Overhaul That maintenance effort (service or action) prescribed to restore an item to 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.
k. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equip-
ment to a Iike-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 (hours/miles, etc.) considered in classifying Army equipment/components.
EXPLANATION OF COLUMNS IN THE MAC, SECTION Il.
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 number shall be 00.
b. Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subas-
semblies, and modules for which maintenance is authorized and its useable on code. Uncoded items are
applicable to all models. Identification of the useable on codes used in this publication are:
Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in
Column 2. (See paragraph B-2 for a detailed explanation of these functions.)
Services-Inspect, test, service, adjust, aline, calibrate, and/or replace.
Fault locate/troubleshoot-the process of investigating and detecting the cause of equipment malfunc-
tioning; 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/func-
tional group coded item to the level of its least componency identified as maintenance significant (i.e., as-
signed as SMR code) for the category of maintenance under consideration.
Actions-welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing.