TM 55-1945-205-10-4
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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 varies at different maintenance levels, appropriate work time figures are to be shown for each level. The
work time figures represent 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 MAC. The symbol designations for the various maintenance levels are as follows:
C - Operator or crew maintenance
O - Unit maintenance
F - Direct support maintenance
L - Specialized Repair Activity (SRA)
H - General support maintenance
D - Depot maintenance
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The “L” maintenance level is not included in column (4) of the MAC. Functions to this level
of maintenance are identified by a work time figure in the “H” column of column (4) and an
associated reference code is used in the remarks column (6). This code is keyed to the
remarks and the SRA complete repair application is explained there.
Column (5) - Tools and Equipment Reference Code. Column (5) specifies, by code, those common tool sets (not
individual tools), common Test, Measurement and Diagnostic Equipment (TMDE), and special tools, special TMDE
and special support equipment required to perform the designated function. Codes are keyed to the entries in the tools
and test equipment table.
Column (6) - Remarks Code. When applicable, this column contains a letter code, in alphabetical order, which is
keyed to the remarks table entries.
Explanation of Columns in the Tools and Test Equipment Requirements
Column (1) - Tool or Test Equipment Reference Code. The tool or test equipment reference code correlates with a
code used in column (5) of the MAC.
Column (2) - Maintenance Level. The lowest level of maintenance authorized to use the tool or test equipment.
Column (3) - Nomenclature. Name or identification of the tool or test equipment.
Column (4) - National Stock Number (NSN). The NSN of the tool or test equipment.
Column (5) - Tool Number. The manufacturer’s part number, model number or type number.
