Explanation of Columns In The MAC - TM-10-5430-239-12-P0174

TM 10-5430-239-12&P

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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

equipment or a system.

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.

9. Repair - 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, or system.

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, 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 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.

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 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 Assembly (NHA). End item group number shall be "00.""

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.)

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