ARMY TM 9-6115-604-12 NAVY NAVFAC P-8-633-12 C-4.  EXPLANATION OF COLUMNS IN SECTION III. a. Reference Code.  This column consists of a number and a letter separated by a dash.  The number references the T and TE requirements column on the MAC.  The letter represents the specific maintenance functions the item is to be used with.  The letter is representative of columns A through K on the MAC. b. Maintenance Category.  This column shows the lowest level of maintenance authorized to use the special tool or test equipment. c. Nomenclature.  This column lists the name or Identification of the tool or test equipment. d. Tool Number This column lists the manufacturer's code and part number, or National Stock Number of tools and test equipment. C-5.  EXPLANATION OF COLUMNS IN SECTION IV. a. Reference Code.  This column consists of two letters separated by a dash, both of which are references to Section II The first letter references column 5 and the second letter references function, column 3, A through K. b. Remarks.  This column lists information pertinent to the maintenance function being performed, as indicated in the MAC, Section II. SECTION II.  MAINTENANCE ALLOCATION CHART 01 HOUSING AND BASE ASSEMBLY Access Doors and Inspect .1 Covers Service .2 Replace .2 Repair .5 Housing Panels Inspect .1 Service .2 Replace .3 Repair .5 Air Louvers Inspect .1 Service .2 Adjust .1 Replace .3 Repair .5 Skid Base Inspect .1 Service .1 Repair .5 Tool Box Inspect .1 Service .1 Replace .3 Repair .5 Fire Extinguisher Inspect .1 Service .2 Replace .1 C-43 TOOLS AND EQUIP MAINTENANCE FUNCTION REMARKS COMPONENT ASSEMBLY GROUP NUMBER     C O F H D MAINTENANCE LEVEL UNIT DS GS Depot