TM 55-1930-209-14&P-19 Table 7-2.  Preventive Maintenance Checks and Services for Compressed Air 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 I.  Air filter 1.  When pressure regulators indicate dirt and grit in the system and for semiannual PMCS, perform the following: 1) Shut down air compressor system. 2) Redtag power panel 1 circuit breaker 3P5 indicating: 'WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." 3) Manually, without using a wrench, unscrew ring nut attaching bowl guard and plastic filter bowl to filter head and remove guard, bowl, and bowl gasket. 4) Unscrew filter element screw and carefully remove lower baffle, gasket, filter element, gasket, shroud, and upper baffle.  Place them on dean cloth in the sequence shown. 5) Wash filter element in soap and water, rinse, and allow to dry.  Replace ele- ment (NSN 4330-00803-1028) if cracked, chipped, or deformed or if unable to clean to original color. 6) Wash filter bowl and all other parts with soapy water.  Rinse and dry with lint-free cloth. 7)  Inspect each part and replace any damaged or worn parts using bowl kit (CAGEC 04049, P/N 36017-BKF-329). 8) Assemble parts in sequence on the fil- ter element screw.  Screw filter ele- ment screw into filter head. 9) Carefully install plastic filter bowl, guard, and gasket.  Then secure to fil- ter head with ring nut.  Tighten hand- tight without using a wrench. 10) Start air compression system.  Check for and correct any deficlencies. 11) Remove red tag from power panel 1 circuit breaker 3P5. 7-26 Change 1