c. Service. Operations
pressed air supplies.
required periodically to keep an item in proper operating condition, i.e., to clean
to preserve, to drain, or to replenish fuel, lubricants, hydraulic fluids, or com
d. Adjust. To maintain within prescribed limits, by bringing into proper or exact position, or by setting
the operating characteristics to the specified parameters.
e. Align. To adjust specified variable elements of an item to bring about optimum or desired
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 measurement. Consists of comparison of two instru-
ments, one of which is a certified standard of known accuracy, to detect and adjust any discrepancy in the
accuracy of the instrument being compared.
g. Install The act of emplacing, seating, or fixing into position an item, part, or module (component or
assembly) in a manner to allow the proper functioning of an equipment or system.
h. Replace. The act of substituting a serviceable like type part, a subassembly, or module (component or
assembly) for an unserviceable counterpart.
i. Repair. The application of maintenance services (inspect, test, service, adjust, align, calibrate or
replace) or other maintenance actions (welding, grinding, riveting, straightening, facing, remachining, or
resurfacing) to 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.
j. Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable operational condition as prescribed by maintenance standards in appropriate technical publica-
tions (i.e., DMWR). Overhaul is normally the highest degree of maintenance performed by the Army.
Overhaul does not normally return an item to a 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 material maintenance applied to Army equipment. The rebuild operation includes the act of returning to
zero those age measurements (hours/miles, etc. ) considered in classifying Army equipment/components.
B-4. EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a. Column (1), Group Number. Column 1 lists functional group code numbers which are assigned to
identify maintenance significant components, assemblies, subassemblies, and modules to their next higher
b. Column (2), Component/Assembly. Column 2 contains the item names of components, assemblies,
subassemblies, and modules for which group numbers (column 1) are assigned and for which maintenance
c. Cohmm (3), Maintenance Function. Column 3 lists the functions to be performed on items listed in
column 2. (Function definitions are contained in paragraph B-3).
d. Column (4), Maintenance Level. The maintenance levels, Unit, intermediate, and Depot, are allotted
separate subcolumns within column 4. Entrv of a work time figure (such as 1.0, 0.2) in a subcolumn
indicates that that level is authorized to perform the function listed in column 3, and the average time re-
quired to do the function is the work time figure, If the number or complexity of tasks within a main-
tenance function varies from one maintenance level to another, the applicable work time figure for each
level will be entered for that function. The work time figure represents the average time it takes to restore a
component/assembly to a serviceable condition under a typical field operating environment.
Change 4 B3