TB 9-6115-644-13
B-2.7 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.
B-2.8 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.
B-2.9 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.
B-2.10 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 publication. Overhaul is
normally the highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like new
condition.
B-2.11 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 measurement (e.g., hour/miles)
considered in classifying Army equipment/components.
B-3
EXPLANATION OF COLUMNS IN THE MAC, SECTION II.
B-3.1 Column (1), Functional Group Number. Column (1) lists Functional Group Code (FGC) numbers, the purpose of
which is to identify maintenance significant components, assemblies, subassemblies, and modules with the Next Higher
Assembly (NHA).
B-3.2 Column (2), Component/Assembly. Column (2) contains the names of components, assemblies, subassemblies, and
modules for which a maintenance function is authorized.
B-3.3 Column (3), Maintenance Function. Column (3) lists the functions to be performed on the item listed in Column (2).
(For detailed explanation of these functions, refer to "Maintenance Functions" outlined in paragraph B-2).
B-3.4 Column (4), Maintenance Level. Column (4) specifies each level of maintenance authorized to perform each function
listed in column (3), by indicating work item required (expressed as man-hours in whole hours or decimals in the appropriate
sub column. This work-time 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 varies 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 MAC. The symbol designations for the various
maintenance levels are as follows:
1
Services - inspect, test, service, adjust, align, calibrate, and/or replace.
2
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).
3
Disassembly/assembly - The step-by-step breakdown (taking apart) of a spare/functional group coded item to the level of its least component (i.e.,
assigned an SMR code) for the level of maintenance under consideration (i.e., identified as maintenance significant).
4
Actions - Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
B-2
