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
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 sys-
tem) 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.
Column 6, Remarks. When applicable, this column contains a letter code, in alphabetical order, which is keyed
to the remarks contained in Section IV.
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.