Explanation of Columns in the MAC - TM-9-4120-430-140298

TM 9-4120-430-14

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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 proper functioning of the 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.

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

disassembly/assembly procedures, and maintenance actions to identify troubles 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.

NOTE

The following definitions are applicable to the Repair maintenance function:

Service... 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.

10. Overhaul. That periodic maintenance effort (service/action) prescribed to restore an item to a completely ser-

viceable/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.

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 material

maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age

measurements (e.g., hours/miles, etc.) 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 sig-

nificant components, assemblies, subassemblies, and modules with the Next Higher Assembly (NHA).

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.)

Column (4) -- Maintenance Level. Column (4) specifies each level of maintenance authorized to perform each function

listed in column (3), by indicating work time 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. Should 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

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