MAINTENANCE FUNCTIONS. (cont.)
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
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.
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 3rd position code of the SMR code.
Repair. The application of maintenance services1, including fault location/troubleshooting2, removal
installation and disassembly/assembly3, procedures and maintenance actions4 to identify troubles and restore service-
ability to an item by correcting specific damage, fault, malfunction or failure in a part, subassembly, module (component or
assembly), end item or system.
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 usually does not return an item
to like new condition.
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, aline, 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).
3Disassemble/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 (i.e., assigned as SMR code)
for the category of maintenance under consideration.
4Actions-welding, grinding, riveting, straightening, facing, remachining, and/or resurfacing.