B-2. MAINTENANCE FUNCTIONS (Cont'd).
Calibrate. To determine and make corrections or to adjust instruments or test, measuring, and diagnostic
equipment used in precision measurement. It consists of comparisons of two instruments, one being a certified standard
of known accuracy, to detect and adjust any discrepancy in the accuracy of the instrument being compared.
Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of emplacing, seating, or fixing into position a spare, repair part, or module (component
or assembly) in a manner to allow the proper functioning of an equipment or system.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC and is shown as the 3rd position code of the SMR code.
Repair. The application of maintenance services, including fault location/trouble-shooting, removal/installation,
and disassembly/assembly procedures, and maintenance actions to identify troubles and restore serviceability to an item
by correcting damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item,
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in an appropriate technical publication (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.
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 in 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-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
Column 1, Group Number. Column 1 lists the functional group code numbers, in order to identify maintenance
significant components, assemblies, subassemblies, and modules with the next higher assembly. End item group shall
Column 2. Component/Assembly. Column 2 contains the name of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
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.)