TM 5-3895-373-20 B.3. EXPLANATION  OF  COLUMNS  IN  THE  MAC, SECTION II a. Column   1,   Group   Number.      Column   1   lists functional group code numbers, the purpose of which is to    identify    maintenance        significant        components, assemblies,  subassemblies,  and  modules  with  the  next higher assembly. b. Column   2,   Component/Assembly.      Column   2 contains  the  item  names  of  components,  assemblies, subassemblies,  and  modules  for  which  maintenance  is authorized. c. Column  3,  Maintenance  Functions.    Column  3 lists the functions to be performed on the items listed in column 2.  (For detailed explanation of these functions, see paragraph 2.) d. Column   4,   Maintenance   Level.      Column   4 specifies,  by  the  listing  of  a  work  time  figure  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  complexity  of  the tasks   within   the   listed   maintenance   function   vary   at different  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    preparation    time (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   symbol   designations   for   the various maintenance levels are as follows: C -- Operator/crew O -- Organizational maintenance F -- Direct support maintenance H -- General support maintenance L -- Specialized Repair Activity (SRA)' 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. Codes are keyed to tools and test equipment in Section m. f. Column  6, Remarks.  This column  shall, when applicable,  contain  a  letter  code,  in  alphabetic  order, which    ,  shall  be  keyed  to  the  remarks  contained  in Section IV. B.4. EXPLANATION OF COLUMNS IN THE TOOLS AND TEST EQUIPMENT REQUIREMENTS, SECTION III a. Column  1, Reference  Code.  The  tool and test equipment code correlates with a code used in the MAC, Section II, column 5. b. Column 2, Maintenance Level.  The lowest level of   maintenance   authorized   to   use   the   tool   or   test equipment. c. Column 3, Nomenclature. Name or identification of the tool or test equipment. d. Column    4,    National    Stock    Number.        The National Stock Number of the tool or test equipment. e. Column  5,  Tool  Number.    The  manufacturer's part number, model number, or type number. B.5. EXPLANATION OF COLUMNS IN REMARKS, SECTION IV a. Column 1, Code.  The code recorded in column 6, Section II. b. Column    2,    Remarks.        This    column    lists information pertinent to the maintenance function being performed as indicated in the MAC, Section II. ⁵ This  maintenance  level  is  not  included  in  Section  II, column     4     of     the     Maintenance     Allocation     Chart. Functions to this level of maintenance are identified by a   work-time   figure   in   the   "H"   column   of   Section   II, column 4, and an associated reference   code is used in the Remarks column 6.  This code is keyed to Section IV, Remarks, and the SRA complete repair application is explained there. B-2