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 being compared.
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 the assigned maintenance level is shown as the third 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 serviceability 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 does not normally 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 (e.g., hours/miles) considered in
classifying Army equipment/components.
EXPLANATION OF COLUMNS IN THE MAC, SECTION II
Column (1), System. Column 1 lists the major systems by which all components and assemblies of the vehicle are divided.
This division reflects the overall arrangement of the Commercial Off The Shelf (COTS) manuals for the vehicle.
Column (2), Component/Assembly. Column 2 contains the item names of components, assemblies, subassemblies, and
modules for which maintenance is authorized.
Column (3), Maintenance Function. Column 3 lists functions to be performed on the item listed in Column 2. (For detailed
explanation of these functions, see paragraph B-2.)
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
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.