TM 5-3805-254-20-2 B-4. EXPLANATION    OF    COLUMNS    IN    TOOL    AND    TEST    EQUIPMENT    REQUIREMENTS,    Section    III CONTINUED. c. Column 3, Nomenclature.  Name or identification of the tool or test equipment. d. Column   4,   National/NATO   Stock   Number.      The   National   or   NATO   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 1, Reference Code .  The code recorder 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 ENGINE 0100 Engine Assembly Inspect 0.5 Service 0.2 1,3 Replace 8.0 1,4,10 Repair 8.0 54.0 1,4 Overhaul 79.0 1,4 Engine Mount Replace 4.0 1,4 0101 Crankcase, Block, Cylinder Head Engine Block Inspect 2.0 1,4 Repair 40.0 1,4 Cylinder Head Inspect 1.0 1,4 Repair 7.0 1,4 Replace 10.0 1,4 Cylinder and Sleeve Assembly Replace 18.0 1,4 Change 1  B-3