TM 55-1930-209-14&P-19 Table 17-4.  Preventive Maintenance Checks and Services for Workboat, Lifesaving, and Firefighting Equipment Systems (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. Check marker light batteries.  Replace or Marker light bat- recharge as necessary. teries not charged or missing. 3 Life Vests CAUTION Keep life vests away from lubricants and fuels.  If splashed with oil, lubricants, or fuel oil, wipe off immediately.  Then wash clean with soap and water.  Rinse thoroughly. Never store wet life vests or other lifesaving items in a closed storage container.  Hang in a well-ventilated space until completely dry. When dry, brush life vests and inspect other items for damage or wear before returning lifesaving equipment to its authorized stowage point. • • • · · · a. Check that fife vests are clean and free of oil, lubricants, or fuel oil.  Clean with soapy water, rinse and dry as necessary. • • • · · · b. Ensure that clean and dry life vests are stored in a clean, dry stowage area. FIREFIGHTING WARNING SYSTEM Monobromotrifluoromethane liquid or gas can cause DEATH Or serious injury if personnel fail to observe safety precautions. •  Inhalation of monobromotrifluo- romethane gas (Halon 1301) at concen- trations of 5% to 6% for more than 4 or 5 minutes may result in serious cardiac or central nervous system effects. •    Liquid Halon 1301 (including the spray in the immediate vicinity of discharge) may freeze the skin (frostbite) on contact. Wear protective clothing and eve protec- tion to avoid such contact.  In the event of frostbite, warm the affected area quickly to body temperature.  Immerse hands in warm water or place hands in armpits. Get medical attention promptly. 17-20