TM 55-1930-209-14&P-19 Table 17-4.  Preventive Maintenance Checks and Services for Workboat, Lifesaving, and Firefighting System (Continued) B - Before D - Daily Q -  Quarterly D - During W - Weekly S -  Semiannually A - After M - Monthly A -  Annually INTERVAL ITEM PROCEDURES EQUIPMENT ITEM TO BE CHECK FOR AND HAVE IS NOT READY/ NO. INSPECTED REPAIRED OR ADJUSTED AVAILABLE IF B   D   A   D  W  M   Q   S   A AS NECESSARY c. Make certain that horn valve is left open until all pressure is relieved from hose. d. Notify shift leader or bargemaster for requirement to remove or replace C02 gas cylinders. e. Rewind hose on rack or reel and replace horn in clip. The valve must be left in its closed position. f. For remote control systems, pull the con- trol cable back and forth between the cylinder(s) and break-glass pull box to make certain it operates freely. Replace glass at the pull box. g. Check control head to make sure safety pin is installed and activating lever has not been pulled. h. Check SET/RELEASED indicator on side of control head to make sure it is in SET position. If not, take screwdriver and move to SET position. i. Check hoses for cracks, breaks, loose Hoses cracked or piping connections to cylinders, and broken. loose nozzles. Operate horn valve sev- eral times to make sure the valve does not stick. CAUTION Do NOT use water or oxygen for blowing out. The use of oxygen, especially, is dan- gerous as the possible presence of even a minute quantity of oil may cause an explo- sion. j. Blow out C02 hose/reel system with air or carbon dioxide to make sure that it is not plugged. Run hose out to its full length. 17-23