9. Repair. The application of maintenance services, including fault location/troubleshooting,
removal/installation, disassembly/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.
The following definitions are applicable to the repair maintenance
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/functional 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 resurfacing.
10. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational 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 condition.
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 Functional Group Code (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 detailed explanation of these functions refer to Maintenance Functions outlined
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform
each function listed in column (3), by indicating worktime required (expressed as man-hours in whole hours
or decimals) in the appropriate subcolumn. This worktime figure represents the active time required to
perform that maintenance function at the indicated level of maintenance. If the number or complexity of the
tasks within the listed maintenance function varies at different maintenance levels, appropriate work time
figures are be shown for each level. The worktime figure represents the average time required to restore an
item (assembly, subassembly, component, module, end item, or system) to a serviceable condition under
typical field operating conditions. This time includes preparation time (including any necessary
disassembly/assembly time), troubleshooting/fault location time, and quality assurance time in addition to
the time required to perform the specific tasks identified for the maintenance functions authorized in the
MAC. The symbol designations for the various maintenance levels are as follows:
C . . . . . . . . . . . .
Operator or crew maintenance
O . . . . . . . . . . .
F. . . . . . . . . . . .
Direct support maintenance
L. . . . . . . . . . . .
Specialized repair activity (SRA)
H . . . . . . . . . . .
General support maintenance
D . . . . . . . . . . .