TM 10-4610-239-24
TM 08580B-24/3
B-3. Explanation of Columns in the MAC, Section II
a.
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).
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 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" previously
defined).
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 sub column. 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:
C
Operator or Crew maintenance
O
Unit maintenance
F
Direct Support maintenance
Sustainment:
H
General Support maintenance
D
Depot maintenance
e.
Column (5) Tools and Test 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 in Section III.
f.
Column (6) Remarks Code. When applicable, this column contains a letter code, in alphabetical order,
which is keyed to the remarks table entries in Section IV.
Change 1 B-3
