B-2
Change 4
B-2. MAINTENANCE FUNCTIONS (Con’t).
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SERVICE. Operations required periodically to keep an item in proper operating condition,
to preserve, to drain, to paint, or to replenish fuel, lubricants, chemical fluids, or gases.
TM 9-2350-267-20
i.e., to clean (includes decontamination, when required),
ADJUST. To maintain or regulate, within prescribed limits, by bringing into proper or exact position, or by setting the operating characteristics to
specified parameters.
ALINE. To adjust specified variable elements of an item to bring about optimum or desired performance.
CALIBRATE. To determine and cause corrections to be made or to be adjusted on instruments or test, measuring, and diagnostic equipments used
in precision measurement. 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 instrument being compared.
REMOVE/INSTALL. To remove and install the same item when required to perform service or other maintenance functions. Install maybe 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 3d position code of the SMR code.
REPAIR. The application of maintenance services, including fault Iocation/troubleshooting, removal/installation, and disassembly/assembly
procedures, and maintenance actions 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.
OVERHAUL. That maintenance effort (service/action) required to restore an item to a completely serviceable/operational condition as 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 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 is the highest degree of materiel 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.
a. COLUMN 1, GROUP NUMBER. Column 1 lists functional group code numbers, the purpose of which is to identify maintenance significant
components, assemblies, subassemblies, and modules with the next higher assembly. End item group number shall be “00.”
