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
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
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 of 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 detailed explanation of these functions, refer to Maintenance Functions outlined above.)
Column (4) Maintenance Level. The Maintenance Levels AVUM, AVIM and DEPOT are listed on the MAC with
individual columns that include work times for maintenance functions at each maintenance level. Work time
presentations such as 0.1 indicate the average time (expressed as man-hours in whole hours or decimals) it
requires a maintenance level to perform a specified maintenance function. If a work time has not been established,
the columnar presentation will indicate . Maintenance levels higher than the level of maintenance indicated are
authorized to perform the indicated function.
Column (5) Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool sets (not
individual tools), common TMDE, and special tools, special TMDE and special support equipment required to perform
the designated function.
Column (6) Remarks Code. When applicable, this column contains a letter code, in alphabetic order, which is keyed
to the remarks.
Explanation of Columns in Tool and Test Equipment Requirements
Column (1) Tool or Test Equipment Reference Code. The tool or test equipment reference code correlates with a
code used in column (5) of the MAC.
Column (2) Maintenance Level. The lowest level of maintenance authorized to use the tool or test equipment.
Column (3) Nomenclature. Name or identification of the tool or test equipment.
Column (4) National Stock Number (NSN). The NSN of the tool or test equipment.
Explanation of Columns in the Remarks
Column (1) Remarks Code. The code recorded in column (6) of the MAC.
Column (2) Remarks. This column lists information pertinent to the maintenance function being performed as
indicated in the MAC.