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MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - TM-9-2320-386-24-1-20690
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EXPLANATION OF COLUMNS IN THE REMARKS - TM-9-2320-386-24-1-20692
TM 9-2320-386-24-1-2
0391 00
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.
NOTE
The following definitions are applicable to the "repair" maintenance
functions:
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 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 above.)
Column (4) Maintenance Level. Column (4) specifies each level of maintenance authorized to perform
each function listed in column (3), by indicating work-time required (expressed as man-hours in whole
hours or decimals) in the appropriate subcolumn. This work-time 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 ...........
Unit maintenance
F. . . . . . . . . . . .
Direct support maintenance
L. . . . . . . . . . . .
Specialized repair activity (SRA)
H ...........
General support maintenance
D ...........
Depot maintenance
0391 00-2

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