MAINTENANCE ALLOCATION CHART (MAC)
Section 1: INTRODUCTION (Cont.)
Explanation of Columns in the MAC
Column (1) Group Number. Column (1) lists 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 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 MAC. The symbol designations for the various maintenance functions are as
C Operator or crew maintenance
O Unit maintenance
F Direction support maintenance
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 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 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.