The Army Maintenance System MAC - Continued
Paint (ammunition only).
To prepare and spray color coats of paint so that the ammunition can be identified and protected. The color indicating
primary use is applied, preferably, to the entire exterior surface as the background color of the item. Other markings
are to be repainted as original so as to retain proper ammunition identification.
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.
The application of maintenance services, including fault location/troubleshooting, removal/installation, 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,
The following definitions are applicable to the " repair" maintenance function:
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.
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. Overhaul is normally the
highest degree of maintenance performed by the Army. Overhaul does not normally return an item to like new
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
Column (1) 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
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 the functions to be performed on the item listed in column (2).
(For a detailed explanation of these functions refer to "Maintenance Functions" outlined above).