CG-47

                     CG 47 CLASS ADVISORY NR 09-95R1                            

                                                                                

 AN-SPY-1B SIGNAL PROCESSOR BEAM STEERING CONTROLLER OPERATING TEMPERATURES     

                                                                                

      REF/A/RMG/AEGIS PROG MGR/011443ZJUN95//                                   

                                                                                

      AMPN/REF A IS CG 47 CLASS ADVISORY 09-95.//                               

                                                                                

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

      SCOPE OF REF A AND WARN THAT OVERTEMPERATURE CONDITIONS MAY NOT ONLY      

      CAUSE CATASTROPHIC CASUALTIES TO THE AN/SPY-1B SIGNAL PROCESSOR, BUT      

      ALSO TO THE BEAM STEERING CONTROLLER CONTAINED IN THE RADAR RECEIVER      

      PROGRAMMER CABINET.  THIS REVISION APPLIES ONLY TO CG 59 THRU CG 73       

      WHICH HAVE THE WATER COOLED SPY-1B SIGNAL PROCESSOR AND BEAM STEERING     

      CONTROLLER.  IT PROVIDES INTERIM GUIDANCE ON RECOMMENDED OPERATING        

      TEMPERATURES AND PROCEDURES UNTIL A MODIFICATION TO ALLOW FOR             

      AUTOMATIC SHUTDOWN HAS BEEN INSTALLED.  THIS REVISION SUPERSEDES AND      

      CANCELS REF A.                                                            

                                                                                

      2.  BACKGROUND.                                                           

           A.  FLEET AND NEW CONSTRUCTION FEEDBACK AND DATA REVIEWS             

      IDENTIFIED A SERIES OF CASUALTIES TO THE AN/SPY-1B SIGNAL PROCESSOR       

      DUE TO LOSS OF ELECTRONIC COOLING WATER (ECW) FLOW OR HIGH ECW            

      TEMPERATURE.  MOST OF THESE CASUALTIES OCCURRED DURING INPORT PERIODS     

      DURING INDUSTRIAL AVAILABILITIES OR IN NEW CONSTRUCTION WHEN ECW WAS      

      SECURED AND THE RADAR EQUIPMENT WAS NOT.  WHILE LOSS OF ECW OR HIGH       

      ECW TEMPERATURE WILL TRIGGER EXISTING ALARMS, AN IMPROVED EQUIPMENT       

      PROTECTION DESIGN IS BEING DEVELOPED WHICH CAN REDUCE THE POSSIBILITY     

      OF THESE COSTLY CASUALTIES.                                               

           B.  THE IMPROVED DESIGN WILL MONITOR THE CABINET AIR TEMPERATURE     

      AND SECURE THE SIGNAL PROCESSOR AND/OR BEAM STEERING CONTROLLER           

      BEFORE EQUIPMENT IS DAMAGED UNLESS OVERRIDDEN BY THE SPY RADAR            

      OPERATOR.                                                                 

                                                                                

      3.  ACTION.  UNTIL PARA 2.B. MODIFICATION IS INSTALLED, CG 59 THRU        

      CG 73 SHOULD COMPLY WITH THE FOLLOWING GUIDANCE TO PREVENT EQUIPMENT      

      DAMAGE:                                                                   

           A.  UPON RECEIVING ANY ONE OF THE HIGH TEMPERATURE/LOW ECW FLOW      

      ALARMS AFFECTING THE SIGNAL PROCESSOR AND THE BEAM STEERING               

      CONTROLLER, IMMEDIATELY INVESTIGATE THE COMMAND AND DECISION              

      (C AND D) SKID AND/OR THE CHILLED WATER SYSTEM FOR THE CAUSE OF THE       

      ALARM.                                                                    

           B.  OBSERVE THE SIGNAL PROCESSOR ECW OUTLET TEMPERATURE GAGES IN     

      RADAR ROOM 3 AND BEAM STEERING CONTROLLER ECW OUTLET TEMPERATURE          

      GAGES IN RADAR ROOMS 2 AND 5, TO MONITOR THE COOLANT TEMPERATURE.         

           C.  SECURE THE SIGNAL PROCESSOR:                                     

                (1)  WHEN ONE OR MORE OF THE TWELVE ECW OUTLET TEMPERATURE      

      GAGES (SIGNAL PROCESSOR OUTLET/RETURN SIDE) REACHES 90 DEG F, OR          

                (2)  WITHIN 5 MINUTES OF A LOSS OF ECW FLOW.                    

           D.  SECURE THE BEAM STEERING CONTROLLER:                             

                (1)  WHEN ECW OUTLET TEMPERATURE (BEAM STEERING CONTROLLERS     

      OUTLET/RETURN SIDE) REACHES 90 DEG F, OR                                  

                (2)  WITHIN 15 MINUTES OF A LOSS OF ECW FLOW.                   

           E.  WHEN ANY ONE OF THE CONDITIONS IN PARA 3.C. OCCURS, AND THE      

      TACTICAL SITUATION REQUIRES CONTINUED SPY OPERATION, EXTEND THE           

      AFFECTED SIGNAL PROCESSOR CABINET FRAMES TO THE FOURTH LOCKING            

      POSITION TO ALLOW FOR CONVECTION COOLING WITH ROOM AIR (PER CSOSS         

      PROCEDURES MCRP 2 AND CRP 2.1).  THE BEAM STEERING CONTROLLER FRAME,      

      CONTAINED IN EACH OF THE RADAR RECEIVER PROGRAMMER CABINETS, SHOULD       

      BE EXTENDED IN THE SAME MANNER WHEN ONE OF THE CONDITIONS IN PARA         

      3.D. OCCURS AND CONTINUED OPERATION IS REQUIRED.  NOTE THAT THE BEAM      

      STEERING CONTROLLER IS LESS SENSITIVE TO ABNORMAL COOLING WATER           

      CONDITIONS AND THEREFORE MEASURES REQUIRED FOR SIGNAL PROCESSOR           

      PROTECTION SHOULD BE GIVEN PRIORITY.                                      

                                                                                

      4.  FOR COMNAVSURFLANT/COMNAVSURFPAC - RECOMMEND CG 59 THRU CG 73 BE      

      TASKED TO ADHERE TO PARA 3 GUIDANCE.                                      

                                                                                

      5.  FOR NSWC PHD (CODE 4C22)                                              

           A.  ENSURE CSOSS PROCEDURES ARE UPDATED AS PART OF THE ECP           

      MODIFICATION.                                                             

           B.  DEVELOP A CSOSS PROCEDURE FOR BEAM STEERING CONTROLLER           

      OVERTEMPERATURE INCORPORATING PARA 3 GUIDANCE.                            

                                                                                

      6.  THIS ADVISORY DOES NOT AFFECT EOSS, PMS OR CMMP.  IT WILL BE          

      CANCELLED WHEN THE MODIFICATION THAT COMMANDS AUTOMATIC EQUIPMENT         

      SHUTDOWN DURING OVERTEMPERATURE CONDITIONS HAS BEEN APPROVED AND          

      INSTALLED IN ALL SPY-1B AND SPY-1B(V) CG 47 CLASS SHIPS (CG 59 THRU       

      CG 73) AND WHEN ALL APPLICABLE CSOSS PROCEDURES HAVE BEEN UPDATED AND     

      DISTRIBUTED.                                                              

                                                                                

      7.  ORIG POC IS N. SMITHSON, PMS400F511, DSN 332-5981 (X133) OR COMM      

      (703) 602-5981 (X133).  TECHNICAL POC IS MR. W. DYKSTRA, PMS400B6AI,      

      DSN 332-7296 OR COMM (703) 602-7296. //                                   

                                                                                

      BT