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-7 Table C-1.  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 NOTE AFTER OPERATION    For less than 12 hour shutdown: 1.   Turn CHECK AUTO-MANUAL switch on electric controller to MANUAL. 2.   Push electric controller STOP button. 3.   Close main supply valve on forward end of receiver by turning handle at right angle to pipe. 4.   Follow procedures a through d below.    For extended shutdown -12 hours or more follow procedures e through on below. 5 Compressor a.   Drain filters  1 and 2 by opening drain valves on bottom of filters b.   Close drain valves when water and mois- ture have drained NOTE Weekly or after every 40 hours of equip- ment operation (whichever occurs first). c.    Barge 1.  Clean compressor air filter by the following procedures. 1)   Redtag power panel 1 circuit breaker 3P5 indicating.  WARNING - DO NOT ACTIVATE.  REPAIRS BEING MADE.' 2)   Shut down air compressor system. 3)   Unscrew by turning clockwise oil cover nut on top of air intake assem- bly on top of compressor. 4)   Remove oil seal and oil cover. C-9