Explanation of Columns in the MAC

TM 5-5420-279-23

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 placing, 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 third

position code of the Source, Maintenance, and Recoverability (SMR) code.

NOTE

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,

which 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.

Repair. The application of maintenance services, including fault location/troubleshooting,

removal/installation, disassembly/assembly procedures, and maintenance actions to identify

problems 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. The 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 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

Column 1, Group Number. Column 1 lists FGC numbers, the purpose of which is to identify

maintenance significant components, assemblies, subassemblies, and modules with the Next

Higher Assembly (NHA).

Appendix B-2 Change 1