TM 10-4610-310-14
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instruments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in
the accuracy of the instrument being compared.
7. Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow proper functioning of an equipment or system.
8. Paint. To prepare and spray color coats of paint so that the ammunition can be identified and protected. The
color indicating primary use is applied, preferably, to the entire exterior surface as the background color of the
item. Other markings are to be repainted as original so as to retain proper ammunition identification.
9. 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 third position code of the Source,
Maintenance and Recoverability (SMR) code.
10. 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 function:
Service 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 break- down (taking apart) of a
spare/functional group coded item to the level of its least component, that is assigned a
SMR code for the level of maintenance under consideration (i.e., identified as
maintenance significant).
ActionsWelding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
11. Overhaul.
The 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 materiel
maintenance applied to Army equipment. The rebuild operation includes the act of returning t zero those age
measurements (e.g., hours/miles) considered in classifying Army equipment/components.
Explanation of Columns in the MAC
a. 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).
b. Column (2) Component/Assembly. Column (2) contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c.
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 see "Maintenance Functions" above.
d. 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 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
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