TM   5-4220-231-14&P Table     2-1. Operator Preventive Maintenance Checks and    Services For    Diving   Operations - (Con't). B-Before D-During A-After W-Weekly ITEM INTERVAL ITEM   TO    BE   INSPECTED. Equipment is NO Not   Ready/ B D A] W PROCEDURE Available If: 2 o o o DACC    (2).    Verify  that    all  knobs, gages, screws, Any   parts     are handles, and     parts     are    present and     serviced IAW missing or the   following procedures. Replace, tighten, or broken. adjust as    required. 4 5 4 5 5 4 5 5 4 2 4 4 4 4 5 4 4 4 44 5 4 4 3 0 0 HP   regulator controls (3).    Turn   knobs     one Knob    does complete turn    clockwise, and    then     turn    them not   turn counterclockwise until  closed. Back    off  1/4   turn. properly. Replace knob     handle if excessively worn. 0 Adjust     as    required to   ensure proper air  flow   to Valve    jams. Volume Tank    Assembly. 2-17