TM 9-4120-357-14
B-3. Column Entries Used in the MAC
a. Column 1, Group Number. Column 1 lists group numbers, the purpose of which is to identify components, as-
semblies, subassemblies, and modules with the next higher assembly.
b. Column 2, Component/Assembly. Column 2 contains the 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, by listing of a "work time" figure in the appropriate subcol-
umn(s), the lowest level of maintenance authorized to perform the function listed in Column 3. This figure represents the
active time required to perform the maintenance function at the indicated level of maintenance. If the number of com-
plexity of the tasks within the listed maintenance function vary at different maintenance levels, appropriate "work time"
figures will be shown for each level. The number of manhours specified by 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, troubleshooting time, and quality
assurance/quality control 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
O
Unit Maintenance
F
Direct Support Maintenance
H
General Support Maintenance
D
Depot Maintenance
e. Column 5, Tools and Equipment. Column 5 specified, by code, those common tool sets (not individual tools)
and special tools, test, and support equipment required to perform the designated functions.
B-4. Column Entries Used in Tool and Test Equipment Requirements
(Not applicable).
b. Remarks. This column lists information pertinent to the maintenance function being performed as indicated on
the MAC, Section II.
B-2
