TM 5-4220-225-14 SECTION II.  MAINTENANCE ALLOCATION CHART FOR MK12 SURFACE SUPPORTED DIVING SYSTEM (1) (2) (3) (4) (5) (6) MAINTENANCE LEVEL GROUP COMPONENT/ MAINTENANCE UNIT INTERMEDIATE   DEPOT NUMBER ASSEMBLY FUNCTION C O F H D TOOLS REMARKS 0201 HELMET BREECH Inspect 0.2 RING Service 0.2 Replace 0.5 15,20,14, 39,41,51, 44,46 0202 VIEW PORTS Inspect 0.2 Replace 0.7 14,15,22, 39,51 0203 LOWER BREECH Inspect 0.2 RING ASSEMBLY Replace 0.4 14,15,41, 51,19,55, 56 Repair 0.6 14,15,39, 41,51,19, 55,56 0204 AIR SUPPLY Inspect 0.1 ASSEMBLY Test 0.5 Adjust 0.4 Repair 3.0 C 020401   AIR SUPPLY Replace 0.3 45,40,13, ADAPTER 8,14,15, 19,51 Repair 0.5 020402   AIR SUPPLY TUBE Inspect 0.2 Replace 0.3 40,22,13, 14,15 020403   AIR SUPPLY VALVE Replace 0.3 Repair 0.5 8,15,19, 26,27 020404   DIFFUSER ASSEMBLY Inspect 0.2 Replace 0.3 26 Repair 0.5 26 B-5