ARMY TM 9-4120-380-14
AIR FORCE TO 35E9-136-21
Replace. To remove an unserviceable item and Install a serviceable counterpart m its place. "Replace" is
authorized by the MAC and is shown as the third position code of the SMR code.
The application of maintenance services, 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 system.
Overhaul. That maintenance effort (service/actions) 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 an item to like new condition.
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
EXPLANATION OF COLUMNS IN THE MAC. SECTION II.
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."
Column 2, "Component/Assembly".
Column 2 contains the 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 m
Column 2 (For a detailed explanation of these functions, see paragraph B.2).
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 coded item to the
level of Its least componency identified as maintenance significant (i.e. assigned an SMR code) for the category of maintenance
Actions - Welding, grinding, riveting, straightening. facing, remachinery, and/or resurfacing.