TM 9-2330-324-14&P
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MAINTENANCE ALLOCATION CHART (MAC)—Continued
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Explanation of Columns in the MAC
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. 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 a detailed explanation of these functions, refer to subparagraph entitled “Maintenance
Functions” immediately 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:
C—Operator or Crew maintenance
O—Organizational maintenance
F—Direct Support maintenance
L—Specialized Repair Activity (SRA)
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. 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 Table 2, Tools and Test Equipment.
Column (6)—Remarks. When applicable, this column contains a letter code, in alphabetic order, which is
keyed to the entries in Table 3, Remarks.
