MAINTENANCE FUNCTIONS (Cont).
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 3d position code of the SMR
Repair. The application of maintenance services1 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.
OverhauI. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in the 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 equip-
ment 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, 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
Column (2)-Component/Assembly. Column 2 contains the item names of components, assem-
blies. 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 detailed explanation of these functions, see paragraph B-2).
When a complete replace or repair task performed at higher level maintenance
includes lower level maintenance tasks (equipment condition/follow-on tasks), the
lower level work time figures in the MAC must be added to the higher level work
time shown in the MAC to determine the total to accomplish that maintenance func-
1. Services-Inspect, test, service, adjust, aline, calibrate, and/or replace.
2. Fault location/troubleshooting-The process of investigating and detecting the cause of equipment malfunctioning; the act of iso-
lating a fault within a system or unit under test (UUT).
3. Disassembly/assembly-The step-by-step breakdown (taking apart) of a spare/function group coded item to the level of its least
component, that is assigned an SMR code for the level or maintenance under consideration (i.e., identified as maintenance signif-
4. Actions-Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.