TM 9-4520-271-14
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INTRODUCTION Continued
Column (3) Maintenance Function. Column (3) lists the functions to be performed on the item listed in column (2).
(For a detailed explanation of these functions, refer to "Maintenance Functions" outlined above.)
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 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 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
NOTE
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.
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