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 TM 55-1905-242-14
0226 00
Maintenance Functions (continued)
8.
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 code of the Source, Maintenance and Recov-
erability (SMR) code.
9.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/installation, disas-
sembly/assembly procedures, and maintenance actions 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.
NOTE
The following definitions are applicable to the "repair" maintenance function:
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/func-
tional 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 resur-
facing.
10. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely serviceable/opera-
tional condition as required by maintenance standards in appropriate technical publications. Overhaul is normally the
highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like new condi-
tion.
11. 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 the act of returning to zero those age measurements (e.g.,
hours/miles) considered in classifying Army equipment/components.
Explanation of Columns in the MAC
Column (1) - Group Number. Column (1) lists FGC numbers, the purpose of which is to identify maintenance significant
components, assemblies, subassemblies, and modules with the Next Higher Assembly (NHA).
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 a
detailed explanation of these functions refer to "Maintenance Functions" outlined above.)
0226 00-2
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