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/ I^D A    FW PROCEDURE Available If: 12 0 Interconnecting hoses and    connectors (12). Out    of   date. a) Inspect each hose for   coupling pullout. b) Ensure each hose has    a   current clean and hydrostatic test date. 0 0 0 Inspect each hose for   blisters, cuts, abrasions, Any   damage cracks, or   other damage. Replace if damaged is  detected. only    if replacement during operation does not impact the operation. 0 0 Inspect each connector for   dents, chips, gouges, Damage scratches, or   other visible damage. prevents hose from    proper seating or has lost    seal. 0 0 Ensure protective caps are secured to   control Protective panel and back panel with    retaining cable and set caps are screws. Replace as    required. missing. 0 Ensure protective caps are    secured to   hose connectors. Replace as    required. 13 0 0 Volume Tank Drain Valve (13). Inspect tank for Valve condensation by   turning valve    to   open position. operation is Observe valve opening for   water drainage. Allow jammed all  water to   drain from   tank. Close valve. excessively tight    or   loose. 14 0 0 Piping (14). Inspect piping on   back of  volume Damage tank control panel for   bent, dented, or   other prevents damaged pipes. Check for   loose connections. normal Tighten as required. operation or has contaminated system. 15 0 0 Frame Assembly (15). Inspect frame for cracked, deteriorated, or   damaged weld    joints, dents, breaks, or   other damage. 0 0 Inspect control panel retaining pins    for serviceability. Ensure cotter pins are in  place. Replace as    required. 2-23