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 TM 55-1905-223-24-5
f. 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.
g. 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.
h. 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 third position code of the SMR code.
i.
Repair.
The application of maintenance services, including fault location/troubleshooting,
removal/installation, and disassembly/assembly procedures, and maintenance actions4 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.
j. Overhaul. That maintenance effort (service/action) necessary to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical publications
[i.e., Depot Maintenance Work Requirements (DMWR)]. 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 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 equipments/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."
1
Services-inspect, test, service, adjust, align, calibrate, and/or replace.
2
Fault locate/troubleshoot-The process of investigating and detecting the cause of equipment malfunctioning;
the act of isolating a fault within a system or unit under test (UUT).
3
Disassemble/assemble-encompasses the step-by-step taking apart (or breakdown) of a spare/functional group
coded item to the level of its least componency identified as maintenance significant (that is, assigned an SMR
code) for the category of maintenance under consideration.
4
Actions-welding, grinding, riveting, straightening, facing, remachinery, and/or resurfacing.
B-2
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