TM  5-4220-231-14&P T" 2-2. Operator Preventive Maintenance Checks,    and   Services for  Chamber Operations -    (Con't). B -   Before D  -   During A  -   After W  -   Weekly ITEM INTERVAL ITEM  TO   BE   INSPECTED Equipment Is NO. B     D    A    W PROCEDURE Not  Ready/ Available     9: 10 0 DASS    (10). Verify  that   all  knobs,    gages, straps, liftrings, Any  parts    are piping, and   other    parts    are   serviceable IAW the   following missing and procedures. Replace, tighten or  adjust    as   required. causesthe equipment not  to operate properly. 10 17 11 15 17 13 17 16 12 15 15 17 13 13 11 17 14 13 16 15 12 17 11 0 Flasks, HP   (11). Inspect end   of  flask   for   manufacturer's Certification label. Ensure flask    has a  valid   test   date (within   3   years). Record shows expired test date. DOT   Label. Inspect label   for   damage. Manufacturer's label is  missing or   fiberglass overwrapis frayed. Change 4 2-33