Section II. TM   5-4930-227-14 B-3.  Explanation  of  Columns  in  Section  Ill a. Reference Code. This column consists number and a letter separated by a dash. number  references  the  T&TE  (Tool  and of  a The Test Equipment) requirements column on the MAC. The letter represents the specific maintenance function the item is to be used with. The letter is  representative  of  columns  A  through  K  on  the MAC. b. Maintenance Level. 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 manu- facturer’s code and part number, or Federal stock number of tools and test equipment. B-4.  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 refer- ences column (5) and the second letter references a maintenance function, column (3), A through K. b. Remarks. This column lists information per- tinent  to  the  maintenance  function  being  per- formed, as indicated on the MAC, section II. 01 0100 0105 0106 03 0301 0304 0306 0309 06 18 1811 ’22 2202 55 5500 76 7603 (2) Function  group ENGINE Engine  Assembly: Engine assembly __________________ Valves,  Camshafts  and  Timing system : Valves;    seat    ________________ Engine Lubrication System Breather, crankcase _______________ FUEL  SYSTEM Carburetor: C a r b u r e t o r    _ _ _ _ _ _ _ _ _ _ _ _ _ _ Air  Cleaner Air  cleaner  assembly  ______________ Tanks,  Lines,  Fittings,  Headers: T a n k ,    f u e l    _ _ _ _ _ _ _ _ _ _ _ _ __ Fuel Filters: Strainer,  sediment  ______________ ELECTRICAL  SYSTEM Ignition  Components: Magneto,  ignition  _______________ Spark   plug   --------------------- BODY, CAB, HOOD AND HULL Tank  Bodies  ____________________ BODY, CHASSIS OR HULL AND ACCESSORY  ITEMS Accessory  Items Hose   assemblies   ______________ N o z z l e     _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ PUMPS Pump  Assembly: Pump,  centrifugal  _______________ FIREFIGHTING EQUIPMENT COM- PONENTS Fire  Extinguishers: Fire   extinguishers   ---------------- B-2