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TM 10-4320-347-13&P
B.3. 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 names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
c. 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, see paragraph B-2.)
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 man hours 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/quality control time in addition to the time
required to perform the specific tasks identified for the maintenance functions authorized in the maintenance
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)
H ...............General support maintenance
D ...............Depot maintenance
e. Column 5, Tools and Test Equipment reference code. Column 5 specifies, by code, those
common tools sets (not individual tools), common TMDE, and special tools, special TMDE, and 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.
B.4. Explanation of Columns in Tools and Test Equipment Requirements, Section Ill.
a. Column 1, Reference Code. The tool and test equipment reference code correlates with a code
used in the MAC, Section II, Column 5.
b. Column 2, Maintenance Level. The lowest level of maintenance authorized to use the tool or test
equipment.
c. Column 3, Nomenclature. Name or identification of the tool or test equipment.
d. Column 4, National Stock Number . The National stock number of the tool or test equipment.
B-3
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