TM 10-1670-305-23&P
MAINTENANCE ALLOCATION CHART (MAC)
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THE ARMY MAINTENANCE SYSTEM MAC - CONT
EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a. Column 1, Group Number. Column 1 lists functional group code numbers, the purpose of
which is to identify maintenance significant components, assemblies, subassemblies, and
modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains the item names of components,
assemblies, subassemblies, and modules for which maintenance is authorized.
c. Column 3, Maintenance Functions. Column 3 lists the functions to be performed on the
item listed in Column 2. (For detailed explanation of these functions, see MAINTENANCE
FUNCTION section).
d. 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 vary 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 allocation chart. The symbol designations for the various maintenance levels are as
follows:
C Operator or crew maintenance
O Unit maintenance
F
Direct support maintenance
L
Specialized Repair Activity (SRA)5
H General support maintenance
D Depot maintenance
e. Column 5, Tools and Test 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.
Codes are keyed to tools and test equipment in Section III.
f.
Column 6, Remarks. When applicable, this column contains a letter code, in alphabetical
order, which is keyed to the remarks contained in Section IV.
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5
This maintenance level is not included in Section II, column (4) of the Maintenance Allocation
Chart. Functions to this level of maintenance are identified by a work-time figure in the “H” column
of Section II, column (4), and an associated reference code is used in the Remarks column (6).
This code is keyed to Section IV, Remarks, and the SRA complete repair application is explained
there.
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