ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or Test, Measuring,
and Diagnostic Equipment (TMDE) used in precision measurement. Consists of comparisons of two instru-
ments, one of which is a certified standardof known accuracy, to detect and adjust any discrepancy in the accu-
racy 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 autho-
rized by the MAC and is shown as the 3rd position code of the SMR code.
Repair. The application of maintenance services, including fault location/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 (compo-
nent or assembly), end item, or system.
Overhaul. That maintenance effort (service/action) prescribed 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 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.
Explanation of Columns in the MAC, Section II
Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which are to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher assem-
bly. End item group number shall be 00.
Column 2, Component/Assembly. Column 2 contains the names of components, assemblies, subassemblies,
and modules for which maintenance is authorized.