B-2. MAINTENANCE FUNCTIONS (CONT).
Calibrate. To determine and cause corrections to be made or to be adjusted on instruments or test, measuring,
and diagnostic equipments 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
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 assigned maintenance level is shown as the 3d position code of the SMR code.
Repair. The application of maintenance services including fault location/troubleshooting2, removal/installation,
and disassembly/assembly' procedures, and maintenance actions4 to restore serviceability to an item by correcting
specific damage, fault, malfunction, or failure in a part, subassembly, module (component or assembly), end item, or
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 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 materiel 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 equipments/components.
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION HI.
Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of which is to identify
maintenance significant components, assemblies, subassemblies, and modules with the next higher assembly.
Column 2, Component/Assembly. Column 2 contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column 3, Maintenance Functions. Column 3 lists the functions to be performed on the
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.