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 e.   Check receiver safety valve on all com- pressors (Barges 1, 2, and 3). 1)   Pull up on safety link on safety valve Air does not on top of receiver.  Air should escape escape from from valve, valve. WARNING System MUST NOT be operated without an operating receiver safety valve.  In the event that the compressor continues to run beyond factory set pressure, this valve reduces receiver pressure to a safe level. 2)   If air does not escape, replace receiver safety valve.  This valve can not be adjusted or repaired.  Replace as follows (a)    Shut down air compressor system. (b)    Redtag power panel 1 circuit breaker 3P5 indicating, “WARNING - DO NOT ACTIVATE. REPAIRS BEING MADE." (c) Unscrew safety valve. (d)    Screw in new safety valve (Barge 1 - P/N 9710-5332-00) (Barges 2 and 3 - P/N 91A033175-001) wrench tight. (e)    Start air compressor system. (f) When receiver pressure gauge reads at least 100 psi, check receiver safety valve by pulling safety link.  Air should escape from receiver thru valve.  If not, repeat above procedures and install another new safety valve.  This valve is NOT adjustable or repairable. (g)    Remove red tag from power panel 1 circuit breaker 3P5. C-11