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TM 10-4320-347-13&P
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 assigned maintenance level is shown as the 3rd position code of the
SMR code.
i. Repair. The application of maintenance services1, including fault location/trouble-shooting2,
removal/installation, and disassembly/assembly3 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) 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.
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.
1Services - Inspect, test, service, adjust, align, calibrate, and /or replace.
2Fault location/troubleshooting - 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).
3Disassembly /assembly - The step-by-step breakdown (taking apart) of a spare /functional group coded
item to the level of its least component, that is assigned an SMR code for the level of maintenance under
consideration (i.e., identified as maintenance significant).
4Actions - Welding, grinding, riveting, straightening, facing, machining, and or resurfacing.
B-2
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