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 f.  Barges 2 and 3.  Remove two compres- sor intake air cleaners on top of compres- sor and replace with two clean air clean- ers.  (If air cleaners are not dirty after 1 month of use, time between changing these cleaners may be extended to every other month.) Replace as follows: 1) Shut down air compressor system. 2) Redtag power panel 1 circuit breaker 3P5 indicating, "WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE." 3)  On top of compressor on each of two air intake filters, loosen setscrews holding air filters to intake manifold. Remove assembly by pulling away from intake manifold. 4) Place cleaned, used air filters onto air intake manifolds by sliding over end of manifold and tightening setscrews. 5) Start air compressor system. 6) Remove red tag from power panel 1 circuit breaker 3P5. WARNING When using compressed air for cleaning     components,     ALWAYS     use protective   shield   to   protect   eyes   and face from flying particles.  Wear gloves and    avoid    skin    damage    by    closing buttons,  collars,  and  rolling  down  shirt sleeves on work clothing. 7) Clean replaced air filters by using compressed air blowing from inside towards outside.  Clean thoroughly until no more dust or particles are blown out of assembly.  Return cleaned air filters to stock for use at next scheduled maintenance. 7-20