ITEM INTERVAL ITEM TO BE PROCEDURES CHECK FOR AND HAVE REPAIRED OR ADJUSTED EQUIPMENT IS NOT READY NO. B    D    A D    W   M    Q   S A INSPECTED AS NECESSARY AVAILABLE IF TM 55-1930-209-14&P-17 Table C-1.  Preventive Maintenance Checks and Services ;or Workboat, Lifesaving, and Firefighting Systems (Continued) B - Before D - Daily Q - Quarterly D - During W - Weekly S - Semiannually A - After M - Monthly A - Annually          a. Check that each portable fire extin- guisher is clearly marked and at its autho- rized fire station.          b. Check that each fire extinguisher is Fire extinguisher undamaged, clean and free from has been dis- obstruction which could cause delay for charged or the emergency access to the device.  Notify inspection tag is bargemaster or shift leader of damage or outdated or inoperability of equipment missing. CAUTION CO2 can cause corrosion of equipment. Clean all materials with soapy water imme- diately after use of this agent. c. Clean hoses and other hardware with soapy water. d. Notify supporting Fire Marshal of require- ment to recharge empty cylinders. 5      Self-Contained Breathing Apparatus (SCBA) WARNINGS All SCBA's onboard must contain an air cylinder marked with a large yellow strike or triangle.  Different SCBA's, although similar in appearance, use different types of air cylinders.  Those onboard use low-pressure, natural air (not oxygen) pressured to 2216 psi when full and marked with a yellow stripe or triangle.  Other SCBA's have similar cylinders pressured to 4500 psi and marked with green.  If a SCBA is attached to the wrong type of cylinder, it may initially check out but could fail during use. The SCBA may not provide a satisfactory face seal if the user wears a full beard or sideburns.  An improper seal around the facepiece limits the protection provided by the SCBA.  If such a condition exists, the user assumes all risks of death or serious bodily injury that may result. C-24