f. Calibrate. To determine and cause corrections to be made or to be adjusted on
instruments or test, measuring and diagnostic equipment used in precision measure-
ment. Consists of comparisons of two instruments, one of which is a certified standard
of known accuracy; to detect and adjust any discrepancy in the accuracy of the instru-
ment being compared,
g. Install. The act of emplacing, seating, or fixing into position an item, part,
or module/component/assembly in a manner to allow the proper functioning of an equip-
ment or system,
h. Replace. The act of substituting a serviceable like type part, subassembly,
or module/component/assembly for an unserviceable counterpart.
i. Repair. The application of maintenance servicesl or other maintenance actions²
to restore serviceability to an item by correcting specific damage, fault, malfunction,
or failure in a part, subassembly, module, component, assembly, of an item or system,
j. Overhaul. The maintenance effort (services/actions) necessary to restore an
item to a completely serviceable/operational condition as prescribed by maintenance
standards (i.e., DMWR) in appropriate technical publication. 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 manufactur-
ing 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 meas-
urements (hours/miles, etc.) considered in classifying Army equipments/components.
COLUMN ENTRIES USED IN THE MAC.
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is
to identify components, assemblies, subassemblies, and modules with the next higher as-
b. Column 2, Component/Assembly. Column 2 contains the names of components, as-
semblies, subassemblies, and modules with the next higher assembly.
c. Column 3, Maintenance Functions. Column 3 lists the function to be performed on
the item listed in column 2. (For detailed explanation of these function, see para-
¹ Services-inspect, test, service, adjust, aline, calibrate, or replace.
²Action welding, grinding, riveting, straightening, facing, remachining, or resurfac-