DDG-51

               DDG 51 CLASS ADVISORY NR 04-94                                   

                                                                                

              PRAIRIE AND MASKER AIR FLOW RATES                                 

                                                                                

 REF/A/LTR/AEGIS PROG MGR/18MAR94/217//                                         

                                                                                

 REF/B/DOC/CDNSWC/-//                                                           

                                                                                

 NARR/REF A IS AEGIS PROG MGR SER 400F/217 REVISING DDG 51 CLASS                

 PRAIRIE AND MASKER AIR FLOW RATES.  REF B IS MRC 5516/R-10Q                    

 (72 B7AD N).//                                                                 

                                                                                

 RMKS/1.  THE PURPOSE OF THIS CLASS ADVISORY IS TO EMPHASIZE THE                

 NEW AND REVISED MAINTENANCE/OPERATIONAL PROCEDURES TO IMPROVE                  

 OVERALL PERFORMANCE OF THE PRAIRIE AND MASKER AIR SYSTEM AS                    

 PROMULGATED BY REF A.                                                          

                                                                                

 2.  BACKGROUND.                                                                

                                                                                

     A.  REF A WAS DEVELOPED TO PROMULGATE REVISED PRAIRIE AND                  

 MASKER AIR FLOW RATES.  REF A FURTHER STATED ECP-DB-1299 WILL                  

 MAKE THESE CHANGES EFFECTIVE DURING PSA FOR DDG 53 THROUGH 61 AND              

 DURING CONSTRUCTION FOR DDG 62 AND FOLLOW.  DDG 51 AND DDG 52                  

 WILL RECEIVE THE FLOW RATE MODIFICATIONS CONTAINED IN ECP-DB-1299              

 IN A FUTURE SHIPALT.                                                           

                                                                                

      B.  REF A REDUCED THE MASKER BELT FLOW RATES WHILE                        

 INCREASING THE FLOW TO THE ROPEGUARD AND FAIRWATER EMITTERS.  IN               

 ADDITION TO REVISING THE FLOW RATES, REF A PROVIDED PEN AND INK                

 CHANGES TO REF B AND THE SHIPS INFORMATION BOOKS.                              

                                                                                

 3.  ACTION.                                                                    

                                                                                

     A.  REVISED MAINTENANCE/OPERATIONAL PROCEDURES AS PROMULGATED              

 BY REF A WILL IMPACT PMS AND THE SHIPS INFORMATION BOOKS (SIB).                

 THE FOLLOWING SUMMARIZED DESCRIPTION HIGHLIGHT THESE NEW                       

 PROCEDURES:                                                                    

                                                                                

         (1)  MASKER AIR FLOW RATES FOR EMITTERS 1, 2 AND 3 WILL                

 BE REDUCED TO 700, 800 AND 900 SCFM RESPECTFULLY.                              

                                                                                

         (2)  ROPEGUARD AND FAIRWATER EMITTERS SUPPLY PRESSURE                  

 SHALL BE INCREASED TO 75 PSI.                                                  

                                                                                

         (3)  LOCKING DEVICES SHALL BE ADDED TO MASKER AIR                      

 THROTTLING VALVES TO PREVENT INADVERTENT MANIPULATION.                         

                                                                                

     B.  FOR DDG 51 THROUGH 53 COMPLY WITH REF A PARA 3.A(1),                   

 3.A(2) AND 3.C ACTIONS TO ACHIEVE CORRECT FLOW RATES AND                       

 ACCOMPLISH REF A ENCL (3) PEN AND INK PMS PROCEDURAL CHANGES.                  

                                                                                

     C.  FOR DDG 54 AND FOLLOW COMPLY WITH REF A PARA 3.B TO                    

 ACHIEVE CORRECT FLOW RATES.                                                    

                                                                                

     D.  FOR DDG 51 THROUGH DDG 54 MAKE PEN AND INK CHANGES TO                  

 VOLUME 6 OF SIB IAW REF A ENCL (1).                                            

                                                                                

 4.  FOR COMNAVSURFLANT/COMNAVSURFPAC - REQUEST TASK DDG 51 CLASS               

 SHIPS TO COMPLY WITH PARA 3 ACTIONS.                                           

                                                                                

 5.  FOR CDNSWC (1413) - ENSURE REF A ENCLOSURE (3) PMS PROCEDURAL              

 CHANGES ARE INCORPORATED INTO REF B.                                           

                                                                                

 6.  FOR SUPERVISORS - ENSURE REF A ENCLOSURE (1) AND (2) SIB                   

 CHANGES ARE INCORPORATED FOR SHIPS UNDER YOUR COGNIZANCE.                      

                                                                                

 7.  FOR SEA 03YD - CONTINUE DEVELOPING NECESSARY MAINTENANCE AND               

 OPERATIONAL PROCEDURES FOR POST ECP-DB-1299 INSTALLATION.                      

                                                                                

 8.  THIS ADVISORY HAS NO EFFECT ON EOSS OR CMMP.  THIS CLASS                   

 ADVISORY WILL BE CANCELLED UPON INCORPORATION OF ECP-DB-1299 INTO              

 A SHIPALT FOR DDG 51 AND DDG 52 AND REF A PMS MODIFICATIONS TO                 

 REF B.                                                                         

                                                                                

 9.  ORIG POC IS MR. N. SMITHSON, PMS400F511, DSN 332-5981,                     

 COMMERCIAL (703) 602-5981 EXT 133.//