TM 9-2320-260-20
B-3. EXPLANATION OF COLUMNS IN THE MAC, SECTION II
a. Column (1) - Group Number. Column 1 lists fictional group code numbers, the purpose of which
is to identify maintenance significant components, assemblies, subassemblies, and modules with the next
higher assembly. End item group number shall be "00."
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 Function. 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 Category. Column 4 specifies, by the listing of a work time figure in
the appropriate subcolumn(s), the category of maintenance authorized to perform the function listed in
Column 3. This figure represents the active time required to perform that maintenance function at the
indicated category of maintenance. If the number or complexity of the tasks within the listed maintenance
function vary at different maintenance categories, appropriate work time figures will be shown for each
category. 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/quality control time in addition to the time
required to perform the specific tasks identified for the maintenance functions authorized in the main-
tenance allocation chart. The symbol designations for the various maintenance categories 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 specifies, by code, those common tool sets (not
individual tools) and special tools, TMDE, and support equipment required to perform the designated
function.
f. Column (6) - Remarks. This column shall, when applicable, contain a letter code, in alphabetic
order, which shall be keyed to the remarks contained in Section IV.
B-4. EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS, SECTION III
a. Column (1) - Reference Code. The tool and test equipment reference code correlates with a code
used in the MAC, Section II, column 5.
b. Column (2) - Maintenance Category. The lowest category of maintenance authorized to use the
tool or test equipment.
c. Column (3) - Nomenclature. Name or identification of the tool or test equipment.
d. Column (4) - National Stock Number. The National stock number of the tool or test equipment.
e. Column (5) - Tool Number. The manufacturer's part number.
B-5. EXPLANATION OF COLUMNS IN REMARKS, SECTION IV
a. Column (1) - Reference Code. The code recorded in column 6, Section II.
b. Column (2) - Remarks. This column lists information pertinent to the maintenance function being
performed as indicated in the MAC, Section II.
B-2
