SPACE HEATER ARCTIC (SHA)
MAINTENANCE ALLOCATION CHART
Column 3, Maintenance Function. Column 3 lists the functions to be performed on the item listed in
Column 2. (For detailed explanation, refer to the previous section entitled Maintenance Functions)
Column 4. Maintenance Level. Column 4 specifies, 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 (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
maintenance allocation chart. 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 specifies, by code, those common tool sets (not individual
tools) common TMDE, and special tools, special TMDE, and support equipment required to perform the
Column 6, Remarks. This column, 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. 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
Column (3) - Nomenclature. Name or identification of tool or test equipment.
Column (4) - National Stock Number (NSN). The NSN of the tool or test equipment.
Column (5) - Tool Number. The manufacturers part number, model number, or type number.
Explanation of Columns in Remarks
Column (1) - Remarks Code. The code recorded in Column (6) of the MAC.
Column (2) - Remarks. This column lists information pertinent to the maintenance function being
performed as indicated in the MAC.