i. Repair. The application of maintenance
services, including fault location /troubleshooting2,
removal / installation, and disassembly / assembly3
procedures and maintenance actions4 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.
(service/action) prescribed to restore an item to
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
k. Rebuild. Consists of those services/actions
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.,
hour/miles) considered in classifying Army equip
B-3. Explanation of Columns in the MAC, Section II.
a. Column 1, Group Number. Column 1 lists
functional grouping codes, the purpose of which is to
assemblies, subassemblies, and modules with the next
b. Column 2, Component / Assembly. Column 2
contains the item names of components, assemblies
subassemblies, and modules for which maintenance is
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 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 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
functions authorized in the maintenance allocation chart.
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)s
H - General support maintenance
D - Depot maintenance
1Services - Inspect, test, service, adjust, align, calibrate, and/or replace.
2Fault 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 (UT).
3Disassembly/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).
4Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
5This maintenance level is not included in Section II, column (4) of the Maintenance Allocation Chart. Functions to this
level of maintenance are identified by a work-time figure in the "H" column of Section II, column (4), and an
associated reference code is used in the Remarks column (6). This code is keyed to Section IV, Remarks, and the
SRA complete repair application is explained there.