TM 10-1670-299-20&P
TO 14D1-2-470-2
NAVAIR 13-1-41
B-3. Explanation of Columns in the MAC, Section II. (CONT)
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 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
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 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)5
H.................. General support maintenance
D.................. Depot maintenance
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5This 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.
B-4
