TM    5-6630-215-12 Table  3-1.  Operator  Preventive  Maintenance  Checks  and  Services  -  Continued NOTE: Within  designated  interval,  these  checks  are  to  be  performed  in  the  order  listed. 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 3-4 B  -  Before D - During Lab-ware Instructions Sulfuric Acid Manganese,  Sulfate Solution Alkaline  Potas- sium  Iodide Solution Starch   Solution Sodium Thiosul- fate Solution FERRIC IRON TEST KIT (fig. 2-7) Case Insert Lab-ware Instructions Ferrover (For 25 ml Samples) Test  Reagent Ferrover (For 5 ml  Samples) Test  Reagent ZINC TEST KIT (fig. 2-10) Case Insert Lab-ware Instructions Zinc, Conditioning Reagent Zinc, Reagent Water,   De-ionized A - After W - Weekly M - Monthly Visual  Inspection  of: 1 - Cases, fittings & inserts for function. Patch or re- place. 2 - Lab-ware. Broken units are to be replaced. 3 - Shelf-life. If expired, re- tain for identification only. Replace. 4 - Containers for leakage and function. Clean up. Tighten caps. Replace. 1 - Less than the quantity of any type of reagent list- ed in Appendix C, required to  perform  function;  or, not of effective shelf life. 2 - Leakage of any contain- er  is  evident  (until  cleaned up  and  replaced). 3 - Lab-ware is broken or missing to an extent that accurate  measurements cannot be made. 4  -  Environmental  exposure has  been  such  that  contain- ers or contents are unre- liable.