B-4. EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a. Column 1, GroupNumber. Group numbers identify maintenance significant components, assemblies, subassem-
blies, 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 items listed in column
2. (For detailed explanation of these functions, see paragraph B-3).
d. Column 4, Maintenance Categories and Work Times.
The maintenance categories (levels) AVUM, AVIM, and
DEPOT are listed on the Maintenance Allocation Chart with individual columns that include the work times for mainte-
nance functions at each maintenance level. Work time presentations such as O. 1 indicate the average time it requires a
maintenance level to perform a specified maintenance function. If a work time has not been established, the columnar pre-
sentation shall indicate -.-. Maintenance levels higher than the level of maintenance indicated are authorized to perform
the indicated function.
e. Column 5 and Section III. Common tool sets (not individual tools), special tools, test, and support equipment
required to perform maintenance functions are listed in Section III with a reference number to permit cross-referencing
to column 5 in the MAC. In addition, the maintenance category authorized to use the device is listed along with the item
National Stock Number (NSN) and, if applicable, the tool number to aid in identifying the tool/device.
f. Column 6 and Section IV. Remarks (identified by an alphabetic code in column 6) and other notes (identified by
a number in parentheses in the applicable column) are listed in Section IV to provide a ready reference to the definition
of the remark/note.