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TM 10-4930-250-13&P
h. Replace.To removeanunserviceableitemandinstalla service-ablecounterpartin itsplace."Replace"is
authorized by the MAC and assigned maintenance level is shown as the third position code of the SMR code.
i. Repair. The application of maintenance services1 including fault location/troubleshooting2, removal/installation,
disassembly/assembly3 procedures, and maintenance action4 to identify troubles and restore serviceability to an item
by correcting specific damage, faults, malfunction or failure in a part, subassembly, module (component or
assembly), end item or system.
j. Overhaul.
That maintenance effort (service/action) prescribed to restore an item to a completely service-
able/operational condition as required by maintenance standards in 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.
k. 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.
B-3 Explanation of Columns in the MAC, Section II
a. 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 to the next higher assembly.
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 detailed explanation of these functions, see paragraph B-2.)
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-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 vary at different maintenance levels, appropriate work-time figures are 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 futictions authorized
in the MAC. The symbol designations for the various maintenance levels are as follows.
C ................................
Operator or crew maintenance
0 ................................
Unit maintenance
F ................................
Direct support maintenance
1Services - Inspect, test, service, adjust, align, calibrate and/or replace.
2 Fault location/troubleshooting
- The process of investigating and detecting the cause of equipment
malfunction. The act of isolating a fault within a system or unit under test.
3Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/ftinctional 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).
4Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
B-2
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