ARMY TM 9-2815-254-24 AIR FORCE TO 38G1-94-2 c. Column 3, Maintenance Function. Column 3 lists the function to be performed on the item listed in column 2. (For detailed explanation of these functions, see paragraph B-2). d. Column 4, Maintenance Category. Column 4 specifies, by the listing of a work time figure in the appropriate s&column(s), the category 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 category of mainte- nance. If the number or complexity of the tasks within the listed maintenance function vary at different mainte- nance categories, appropriate work time figures will be shown for each category. The work time figure repre- sents 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 as- surance/quality  control  time  in  addition  to  the  time  required  to  perform  the  specific  tasks  identified  for  the  main- tenance functions authorized in the Maintenance Allocation Chart. The symbol designations for the various maintenance categories are as follows: C . . . . . . . . . . . . . . . . . Operator or crew O . . . . . . . . . . . . . . . . .   Organization  Maintenance F . . . . . . . . . . . . . . . . .   Direct  Support  Maintenance H General  Support  Maintenance D Depot Maintenance e. Column 5, Tools and Equipment. Column 5 specifies, by code, those common tool sets (not individual tools) and special tools, TMDE, and support equipment required to perform the designated function. f. Column  6,  Remarks.  This  column  shall,  when  applicable,  contain  a  letter  code,  in  alphabetical  order,  which  shall be keyed to the remarks contained in Section IV. B-4 Explanation of Columns in Tool and Test Equipment Requirements,  Section III a. Column 1, Reference Code. The tool and test equipment reference code correlates with a code used in the MAC, Section II, Column 5. b. Column  2,  Maintenance  Category.  The  lowest  category  of  maintenance  authorized  to  use  the  tool  or  test  equip- ment. c. Column 3, Nomenclature. Name or identification of the tool or test equipment. B-3