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TM 1-4920-445-13&P
INTRODUCTION CONTINUED
4.
Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or exact po-
sition, or by setting the operating characteristics to speciied parameters.
5. Align. To adjust speciied variable elements of an item to bring about optimum or desired performance.
6. Calibrate. To determine and cause corrections to be made or to be adjusted on instruments of test, mea-
suring, and diagnostic equipment used in precision measurement. Consists of comparisons of two in-
struments, one of which is a certiied standard of known accuracy, to detect and adjust any discrepancy
in the accuracy of the instrument being compared.
7. Remove/Install. To remove and install the same item when required to perform service or other mainte-
nance functions. Install may be the act of emplacing, seating, or ixing into position a spare, repair part,
or module (component or assembly) in a manner to allow the proper functioning of an equipment or sys-
tem.
8. Paint (ammunition only). To prepare and spray color coats of paint so that the ammunition can be identi-
ied 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 painted as original so as to retain proper
ammunition identiication.
9. Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace"
is authorized by the MAC and the assigned maintenance level is shown as the third position code of the
Source, Maintenance and Recoverability (SMR) code.
10. Repair. The application of maintenance services, including fault location/troubleshooting, removal/in-
stallation, disassembly/assembly procedures, and maintenance actions to identify troubles and restore
serviceability to an item by correcting speciic damage, fault, malfunction, or failure in a part, subassem-
bly, module (component or assembly), end item, or system.
NOTE
The following deinitions 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 taking apart (or breakdown) of a spare/func-
tional group coded item to the level of its least component identiied as maintenance
signiicant (i.e., assigned an SMR code) for the level of maintenance under consideration.
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
11. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely ser-
viceable/operational condition as required by maintenance standards in appropriate technical publica-
tions. Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does
not normally return an item to like new condition.
12. Rebuild. Those service/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 mate-
rial 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.
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