f. Calibrate. To determine and cause corrections
assemblies, subassemblies, and modules with the next
to be made or to be adjusted on instruments or test
measuring, and diagnostic equipments used in precision
Consists of comparisons of two
b. Column 2, Component/Assembly. Column 2
instruments, one of which is a certified standard of
contains the names of components, assemblies,
known accuracy, to detect and adjust any discrepancy in
subassemblies, and modules for which maintenance is
the accuracy of the instrument being compared.
g. Install. The act of emplacing, seating, or fixing
c. Column 3, Maintenance Function. Column 3
into position an item, part, or module (component or
lists the functions to be performed on the item listed in
assembly) in a manner to allow the proper functioning of
Column 2. (For detailed explanation of these functions,
an equipment or system.
h. Replace . The act of substituting a serviceable
d. Column 4, Maintenance Category. Column 4
like type part, subassembly, or module (component or
specifies, by the listing of a work time figure in the
assembly) for an unserviceable counterpart.
appropriate subcolumn(s), the category of maintenance
authorized to perform the function listed in Column 3.
The application of maintenance
This figure represents the active time required to perform
services or other maintenance actions3 to restore
that maintenance function at the indicated category of
serviceability to an item by correcting specific damage,
maintenance. If the number of complexity of the tasks
fault, malfunction, or failure in a part, subassembly,
within the listed maintenance function vary at different
module (component or assembly), end item, or system.
maintenance categories, appropriate work time figures
will be shown for each category. The work item figure
represents the average time required to restore an item
j. Overhaul. That maintenance effort (service/
(assembly, subassembly, component, module, end item,
action) necessary to restore an item to a completely
or system) to a serviceable condition under typical field
serviceable/operational condition as prescribed by
operating conditions. This time includes preparation
maintenance standards in appropriate technical
time, troubleshooting time, and quality assurance/quality
publications (i.e., DMWR). Overhaul is normally the
control time in addition to the time required to perform
highest degree of maintenance performed by the Army.
the specific tasks identified for the maintenance function
Overhaul does not normally return an item to like new
authorized in the maintenance allocation chart. The
symbol designations for the various maintenance
categories are as follows:
k. Rebuild. Consists of those services/actions
necessary for the restoration of unserviceable equipment
C ........................................................ Operator or crew
to a like new condition in accordance with original
F......................................... Direct support maintenance
manufacturing standards. Rebuild is the highest degree
of material maintenance applied to Army equipment.
e. Column 5, Tools and Equipment. Column 5
The rebuild operation includes the act of returning to
specifies, by code, those common tool sets (not
zero those age measurements (hours/miles, etc.)
individual tools) and special tools, TMDE, and support
considered in classifying Army equipment/components.
equipment required to perform the designated function.
B-3. EXPLANATION OF COLUMNS IN THE MAC,
f. Column 6, Remarks. This column shall, when
applicable, contain a letter code, in alphabetic order,
which shall be keyed to the remarks contained in Section
a. Column 1, Group Number. Column 1 lists
functional group code numbers the purpose of which is
to identify components,
Services - inspect, test, service, adjust, aline, calibrate, or replace.
Actions - welding, grinding, riveting, straightening, facing, remachining, or resurfacing.