TM 5-6350-264-14&P-12
NAVELEX EE 181-AA-OMI-120/E121 C-7359-60-1
TO 31S9-2FSS9-1-12
B-3
Explanation of Columns in the MAC
Column (1) Group Number. Column (1) lists Functional Group Code (FGC) numbers, the
purpose of which is to identify maintenance significant components, assemblies, subassemblies,
and modules with the Next Higher Assembly (NHA
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. 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:
Field
includes three subcolumns, Crew maintenance (C), Service maintenance
(O), and Field maintenance (F).
Sustainment includes two subcolumns, Below Depot (H) and Depot Maintenance
(D).
NOTE
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 there.
Change 2 B-4
