TM 9-4520-257-12&P 0041 00
Column (3) Maintenance Function. Column 3 contains the functions to be performed on the item
listed in Column 2. (For a detailed explanation, refer to the previous section entitled Maintenance
Column (4) Maintenance Level. Column 4 contains, by the listing of a work time figure (expressed as
man-hours shown as whole hours or decimals) in the appropriate subcolumn(s), the level 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 level of maintenance. If the number or the complexity
of the tasks within the listed maintenance function vary at different maintenance levels, appropriate work
time figures will 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 item preparation (such as 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 MAC. The system designations for the various maintenance levels are shown
Operator or crew
Direct Support Maintenance
General Support Maintenance
Column (5) Tools and Equipment. Column 5 contains, by code, those common tool sets (not
individual tools), common TMDE and special tools, special TMDE, and support equipment required to
perform the designated function.
Column (6) Remarks. Column 6, when applicable, contains a letter code, in alphabetic order, which is
keyed to the remarks contained in Table 3.
EXPLANATION OF COLUMNS IN THE TOOLS AND TEST EQUIPMENT REQUIREMENTS
Column (1) Tool or Test Equipment Reference Code. Column 1 contains the tool or test equipment
reference code that correlates with a code used in Column 5 of the MAC.
Column (2) Maintenance Level. Column 2 contains the lowest level of maintenance authorized to use
the tool or test equipment.
Column (3) Nomenclature. Column 3 contains the name or identification of a tool or test equipment.
Column (4) National Stock Number (NSN). Column 4 contains the NSN of the tool or test equipment.
Column (5) Tool Number. Column 5 contains the manufacturers part number, model number, or type
EXPLANATION OF COLUMNS IN REMARKS
Column (1) Remarks Code. Column 1 contains the code recorded in Column 6 of the MAC.
Column (2) Remarks. Column 2 contains the information pertinent to the maintenance function being
performed as indicated in the MAC.