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TM 5-2420-222-20-3
MAINTENANCE FUNCTIONS - Continued
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
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 is shown as the third position of the SMR code.
Repair. The application of maintenance services, including fault location/troubleshooting, removal/installation, and
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.
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 materiel 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.
EXPLANATION OF COLUMNS IN THE MAC, SECTION II
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. End item group number
shall be "00." Column 2, Component/Assembly. Column 2 contains the names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in Column 2. (For a
detailed explanation of these functions, refer to Maintenance Functions, page B-1.) Column 4, Maintenance Level.
Column 4 specifies, by the listing of a work time figure in the appropriate subcolumn(s), the level of maintenance
authorized to perform the function listed in Column 3. This figure represents the active time required to perform that
maintenance function at the indicated level of maintenance. If the number or complexity of the tasks within the listed
maintenance function vary at different maintenance levels, appropriate work time figures will be shown for each level. The
work time figure represents the average time required to restore an item (assembly, subassembly, component, module,
end item, or system) to a serviceable condition under typical field operating conditions. This time includes preparation time
(including any necessary disassembly/assembly time), troubleshooting/fault location time, and quality assurance/quality
control time in addition to the time required to perform the specific tasks identified for the maintenance functions
authorized in the Maintenance Allocation Chart. The symbol designations for the various maintenance levels are as
follows:
C........ Unit (Operator or Crew)
O ....... Unit (Organizational) Maintenance
F ........ Direct Support Maintenance
H........ General Support Maintenance
D........ Depot Maintenance
Column 5, Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individual tools) and special
tools, TMDE, and support equipment required to perform the designated function.
Change 1 B-2
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