MAINTENANCE ALLOCATION CHART (MAC)
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. The 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 Unit maintenance
F Direct Support maintenance
L Specialized Repair Activity
H General Support maintenance
D Depot maintenance
The "L" maintenance level is not included in column (4) of the MAC. Functions
to this level of maintenance are identified by 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
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.
Column (6) Remarks Code. When applicable, this column contains a letter code, in alphabetical order, which is
keyed to the remarks table entries.