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TM 1-4920-438-13&P
4. Adjust. To maintain or regulate, within prescribed limits, by bringing into proper position, or exact position, or
by setting the operating characteristics to specified parameters.
5. Align. To adjust specified 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 or test,
measuring and diagnostic equipment 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.
7. 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.
8. Paint. To prepare and spray color coats of paint so that the ammunition can be 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 painted as original so as to retain proper ammunition identification.
9. 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 third position code of the Source,
Maintenance and Recoverability (SMR) code.
10. Repair. The application of maintenance services, including fault location/troubleshooting, removal 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 definit8ions 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/functional group coded item to the level of its least component identified as
maintenance significant (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
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.
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 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.
Explanation of Entries in the MAC
Group Number and Component/Assembly. The functional groupings in the sample below identify maintenance
significant components, assemblies, subassemblies, and modules with the next higher assembly.
Columns (1) and (2) Functional Groups. The functional groupings in the sample below identify maintenance
significant components, assemblies, subassemblies, and modules with the next higher assembly.
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