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 I    D I   A W PIR CEDURE Available If: 16 0 0 VolumeTank(16). Inspect tank    for  dents, gouges, or   other damage. 0 0 Ensure all  plugs are    in   place and tightened. Tighten as    required. 0 0 Ensure mounting bolts are in  place and tightened. Replace and/or tighten as    required. 17 0 0 DASS (17). Verify   that all   knobs, gages, straps, Any    broken or liftrings, piping, and parts are present and missing part serviceable IAW  the following procedures. prevents Replace, tighten or   adjust as    required. normal operation. 24 23 24 18 24 17- 19 24 20 18 20 24 21 24 20 23 19 18 24 ' @2 24 18 24 0 21 24 ,@n 2-24