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 manhours 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 vary at different maintenance levels, appropriate work-time figures
are 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 maintenance allocation chart. The symbol
designations for the various maintenance levels are as follows:
Operator or crew maintenance
Direct Support maintenance
H. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Support maintenance
D. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
e. Column (5), Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individual
tools), common TMDE, special tools, special TMDE, and special support equipment required to perform the
designated function. Codes are keyed to tools and test equipment in Section III.
f. Column (6), Remarks. When applicable, this column contains a letter code, in alphabetical order, which
is keyed to the remarks contained in Section III.
B-4. EXPLANATION OF COLUMNS IN TOOL AND TEST EQUIPMENT REQUIREMENTS,
a. Column (1), Item No. The item number correlates with a code used in the MAC, Section II, Column 5.
b. Column (2), Maintenance Category. The lowest level of maintenance authorized to use the tool or test
c. Column (3), Nomenclature. Name or identification of the tool or test equipment.
d. Column (4), National Stock Number. The National/Nato Stock Number of the tool or test equipment.
e. Column (5), Tool No. The manufacturer's part number, model number, or type number.
B-5. EXPLANATION OF COLUMNS IN REMARKS, SECTION IV.
a. Column (1), Reference Code. The code recorded in the MAC, Section II, Column 6.
b. Column (2), Remarks. This column lists information pertinent to the maintenance function being
performed as indicated in the MAC, Section II.