TM 5-3805-274-13&P
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INTRODUCTION - CONTINUED
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/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.
11. 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.
12. 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 (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 a 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 manhours 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
to be shown for each level. The work time 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:
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