Explanation of Columns in the MAC

TM 55-1905-243-24&P

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.

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 preformed 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) considered in classifying Army equipment/components.

A-3 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.)

A-2