DRAFT
TM 5-4210-249-13&P-4
0621
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or by setting
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the operating characteristics to specified parameters.
Align. To adjust specified variable elements of an item to bring about optimum or desired performance.
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Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test,
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measuring, and diagnostic equipment used in precision measurement. Calibration 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
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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.
Paint (ammunition only). To prepare and spray color coats of paint so that the ammunition can be
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identified and protected. The color indicating primary use is applied, preferably, to the entire exterior
surface as the background color of the item. Other markings are to be repainted as original so as to
retain proper ammunition identification.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace"
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is authorized by the MAC and assigned maintenance level is shown as the third position code of the
Source, Maintenance and Recoverability (SMR) code.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/
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installation, 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.
NOTE
The following definitions are applicable to the "repair" maintenance function:
Services. Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault 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).
Disassembly/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).
Actions. Welding, grinding, riveting, straightening, facing, machining, and/or
resurfacing.
Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
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serviceable/operational condition as required by maintenance standards in appropriate technical
publications. 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
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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 (e.g., hours/miles) considered in classifying Army equipment/
components.
0621-2
