ARMY TM 9-2805-257-14 AIR FORCE TO 38G2-103-2 NAVY NAVFAC P-8-612-14E d. Column (4). Maintenance Level. The maintenance levels, Unit, Intermediate, and Depot, are allotted separate subcolumns within column 4. Entry of a work time figure (such as 1.0, 0.2) in a subcolumn indicates that that level is authorized to perform the function listed in column 3, and the average time required to do the function is the work time figure. If the number or complexity of tasks within a maintenance function varies from one maintenance level to another, the applicable work time figure for each level will be entered for that function. The work  time  figure  represents  the  average  time  it  takes  to  restore  a  component/assembly  to  a  serviceable  condition under  a  typical  field  operating  environment. e. Column (5). Tools and Equipment.   Column  5  specifies,  by  code,  common  tool  sets  (not  individual  tools from those sets), common TM DE, and special tools, TM DE, and support equipment required to perform a designated function. The code in Column 5 keys to the listing in Section Ill of the MAC. f. Column (6). Remarks. This column when applicable, contains a letter code with is keyed to an explanation of the code contained in Section IV of the MAC. B-5.  Explanation  of  Columns  in  the  MAC,  Section  Ill. a. Column (1). Tool or Test Equipment Reference Code.   The  tool  or  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 equipment. c. d. e. B-6. a. b. Column (3). Nomenclature. Name or identification of the tool or test equipment. Column (4). National/NATO Stock Number.   The  National  stock  number  of  the  tool  or  test  equipment. Column (5). Tool Number. The manufacturer’s part number. Explanation  of  Columns  in  the  MAC,  Section  IV. Column  (1).  Reference  Code. The code recorded in column 6, Section Il. Column (2). Remarks. This column lists information pertinent to the maintenance function being performed as indicated in the MAC, Section Il. B-3