TM 10-1670-327-23&P
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12. 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).
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 manhours in whole
hours or decimals) in the appropriate subcolumn. This work time figure represents the active time
required to perform that maintenance function at the indicated level of maintenance. If the number or
complexity of the tasks within the listed maintenance function varies at different maintenance levels,
appropriate work time figures are to 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
(including any necessary disassembly/assembly time), troubleshooting/fault location time, and quality
assurance time in addition to the time required to perform the specific tasks identified for the maintenance
functions authorized in the MAC. The symbol designations for the various maintenance levels are as
follows:
Field:
C
Operator or Crew maintenance
O
Unit Maintenance
F
Direct Support maintenance
Sustainment:
L
Specialized Repair Activity
H
General Support maintenance
D
Depot maintenance
NOTE
The "L" maintenance level is not included in column (4) of the MAC. Functions to this
level of maintenance are identified by a work time figure in the "H" column of column (4),
and an associated reference code is used in the REMARKS column (6). This code is
keyed to the remarks and the SRA complete repair application is explained there.
Column (5) Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool
sets (not individual tools), common Test, Measurement and Diagnostic Equipment (TMDE), and special
tools, special TMDE and special support equipment required to perform the designated function. Codes
are keyed to the entries in the tools and test equipment table.
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