TM 10-4320-321-13&P C Operator/Crew O Unit 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  alphabetic  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 I. 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 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. B-5.    Explanation Of Columns In Remarks, Section IV. a. Column I. Reference 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. SECTION II.  MAINTENANCE ALLOCATION CHART (1) (2) (3) (4) (5) (6) MAINTENANCE LEVEL GROUP COMPONENT/ MAINTENANCE UNIT DS GS  DEPOT TOOLS AND NUMBER ASSEMBLY FUNCTION C O F H D EQUIPMENT REMARKS 01 PUMP, SELF-PRIMING INSPECT 0.2 REPLACE 2.0 1, 3 A REPAIR 2.0 4.0 1, 2, 3 B B-3