CG-47


                         CG-47 CLASS ADVISORY NO. 19-85                         

                                                                                

                                                                                

                             RADHAZ/HERO GUIDANCE                               

                                                                                

               COMNAVSEASYSCOM WASHINGTON DC MSG 161520Z SEP 85                 

                                                                                

                                                                                

 REF:            A.      COMNAVSEASYSCOM WASHINGTON DC 242232Z JAN 85           

                 B.      COMNAVSEASYSCOM WASHINGTON DC 102044Z JUN 85           

                 C.      OPNAVNOTE 5100 SER 45/5U394867 OF 30 JUL 85            

                 D.      COMNAVSURFPAC SAN DIEGO CA 062240Z JUN 85 (NOTAL)      

                 E.      USS TICONDEROGA 271830Z JUN 85 (NOTAL)                 

                 F.      SUPSHIP BATH ME 091630Z APR 85 (NOTAL)                 

                 G.      NAVSEA SPDLTR 04H2/RAV/SER 643 OF 28 JUN 82, ACN 4/3   

 TO OP 3565                                                                     

                 H.      COMNAVSEASYSCOM WASHINGTON DC 302110Z NOV 83, ACN 15/3 

 TO OP 3565                                                                     

                 I.      COMNAVSEASYSCOM WASHINGTON DC 261326Z JUN 84, ACN 19/3 

 TO OP 3565                                                                     

                 J.      NAVSEA OP 4154, VOLUME 2                               

                                                                                

                                                                                

 1.      HAZARD AVOIDANCE. THIS CLASS ADVISORY REVISES PREVIOUS GUIDANCE        

 OF REFERENCES A AND B FOR PREVENTING RADIATION HAZARDS (RADHAZ) TO             

 PERSONNEL DURING CG-47 CLASS SHIP OPERATIONS AND MAINTENANCE.  IT              

 INCORPORATES THE NEW RADHAZ GUIDANCE OF REFERENCE C, ESTABLISHES A             

 REVISED RADHAZ ZONE FOR AN/SPY-1A OPERATIONS WITH THE BEAM AT THE              

 ZENITH POSITION AND PROVIDES ADDITIONAL GUIDANCE FOR AN/SPY-1A PMS             

 AND MAINTENANCE OPERATIONS IN RESPONSE TO REFERENCES D AND E.  THE             

 MINIMUM SAFE DISTANCE FOR THE AN/SRQ-4 DIRECTIONAL ANTENNA IS                  

 PROVIDED IN RESPONSE TO REFERENCE F.  PREVIOUS GUIDANCE FOR                    

 PREVENTING HERO PROBLEMS IS NOT CHANGED BY THIS ADVISORY.  THIS                

 ADVISORY SUPERSEDES AND CANCELS REFERENCES A AND B.  END OF                    

 SUMMARY.                                                                       

                                                                                

 2.      CG-47 CLASS SHIPS HAVE SEVERAL RADAR SYSTEMS CAPABLE OF GENERA-        

 TING HIGH LEVELS OF RF ENERGY.  REFERENCE C SPECIFIES PERMISSIBLE              

 EXPOSURE LIMITS (PEL) FOR PERSONNEL EXPOSURE TO RF RADIATION.  THE             

 PEL FOR SHIPS IN PORT ARE MORE STRINGENT THAN THOSE FOR SHIPS AT SEA.          

 FOR RADARS WITH FREQUENCIES GREATER THAN 1.5 GHZ THE PEL IS 5 MW/SQ            

 CM IN PORT AND 10 MW/SQ CM AT SEA.  SOME ELEMENTS OF ORDNANCE USED             

 IN CG-47 CLASS SHIPS ARE SUSCEPTIBLE TO RF ENERGY.                             

                                                                                

 3.      THROUGH A COMBINATION OF PERSONNEL ACCESS CONSTRAINTS, RADIA-          

 TION ZONE CONTROL, OUTPUT POWER CONTROL AND MAINTENANCE OF SAFE                

 SEPARATION DISTANCES, RADHAZ AND HERO PROBLEMS CAN BE PREVENTED.               

 CONTROL FEATURES INHERENT IN THE VARIOUS RADAR SYSTEM DESIGNS, WITH            

 STRICT PROCEDURE IMPLEMENTATION, CAN PROVIDE EFFECTIVE RF SAFETY               

 WITH MINIMAL OPERATIONAL IMPACT.                                               

                                                                                

 4.      RADHAZ PRECAUTIONS IN PORT:                                            

         A.      AN/SPY-1A.  HIGH POWER RADIATION IN PORT IS PERMITTED ONLY     

 WHEN THE QUADRATURE ALIGNMENT OF THE TRANSMITTER IS NOMINAL.  HIGH             

 POWER OPERATION SHALL BE IN MAINTENANCE MODE UNDER LOCAL CONTROL               

 EXCEPT FOR THE FOLLOWING TESTS:                                                

                 (1)     MIP 55AEG02/3, MRC 45 FFZVN D-1 (EII 1.12.X.7.9Y, X=1-4

 TRANSMITTER PHASE AND POWER TESTS OF THE FOUR ARRAYS.                          

                 (2)     EII 1.12.Y.7.22, OPERATIONAL PERFORMANCE TEST MTI WAVE-

 FORM PHASE STABILITY TEST (Y=1, 3).                                            

                 (3)     EII 1.12.1.7.3Z AND 1.12.3.7.3Z, MISSILE UPLINK MONITOR

 (Z=1, 3, 5, 7, 9).                                                             

                                                                                

 THESE TESTS MAY BE CONDUCTED IN PORT USING THE FOLLOWING PROCE-                

 DURE.  PRIOR TO INITIALIZATION AT THE OPERATIONAL READINESS TEST               

 SYSTEM (ORTS) CONSOLE PERFORM THE FOLLOWING:                                   

                 (1)     AT THE RADAR SYSTEM CONTROLLER (RSC) CONSOLE IN BASE-  

 LINE CONTROL:                                                                  

                         (A)     PLACE SEARCH ELEVATION TO ZERO DEGREES.        

                         (B)     HORIZON SEARCH OFF.                            

                         (C)     SEARCH MODE PASSIVE.                           

                         (D)     VERIFY NO SECTOR OR RADIATION ZONES.           

                                                                                

                 (2)     AT THE AN/SPY-1A AN/UYK-7 COMPUTER, POSITION 7 STOP TO 

 THE UP POSITION ON BOTH BAY 3 AND 4.  AN/SPY-1A OPERATION BOTH IN              

 MAINTENANCE MODE UNDER LOCAL CONTROL AND USING THE ABOVE PRO-                  

 CEDURE PLACES THE BEAM AT THE ZENITH POSITION.  FOR THESE OPERATIONS           

 THE HAZARDOUS ZONE IS BOUNDED BY THE BOTTOM OF THE ARRAY, 10 FEET              

 TO EACH SIDE OF THE ARRAY OUT TO A DISTANCE 45 FEET IN FRONT OF THE            

 ARRAY, AND 520 FEET ABOVE THE ARRAY.  THE SAME HAZARDOUS ZONE                  

 SHALL BE USED WHEN RADIATING TO ZENITH IN LOW POWER.  PERSONNEL                

 MUST BE WARNED NOT TO LEAN OVER RAILS ABOVE THE ARRAY FACES.  FOR              

 PMS TESTING REQUIRING RADIATION FROM THE STARBOARD AND/OR PORT                 

 ARRAY, NESTED SHIPS SHOULD BE ADVISED TO KEEP PERSONNEL OUTSIDE THE            

 HAZARDOUS ZONE OR INSIDE THE SKIN OF THE SHIP.  MOST PMS TESTING CAN           

 BE CONDUCTED USING THE FORWARD AND AFT ARRAYS, THEREBY MINIMIZING              

 THE TIME PERIOD FOR RESTRICTED ZONES ON AN ADJACENT SHIP.  THE                 

 HELICOPTER LIGHTING MAINTENANCE PLATFORM ALLOWS PERSONNEL ACCESS               

 TO A RADHAZ ZONE DIRECTLY IN FRONT OF THE AFT ARRAY FACE.  THE                 

 ACCESS IS NORMALLY BARRICADED, BUT STRINGENT PROCEDURAL CONTROLS               

 MUST BE IMPLEMENTED TO PREVENT PERSONNEL FROM INADVERTENTLY AC-                

 CESSING THE AREA WHEN THE RADAR IS ACTIVE.  DURING NORMAL SEARCH               

 AND TRACK OPERATIONS IN LOW POWER, THE MAIN BEAM MINIMUM SAFE                  

 DISTANCE IS 50 FEET.                                                           

         B.      FIRE CONTROL SYSTEM MK 99.  EXTERNAL CW ILLUMINATOR RADIA-     

 TION MUST ALWAYS BE UNDER CONTROL OF C&E:  E.G., SIMULATED ENGAGE-             

 MENT.  THE BEAM MUST NOT BE DIRECTED TOWARD ANY BUILDING OR SHIP               

 STRUCTURE; I.E., CRANES, BUILDINGS, TOWERS AND ADJOINING SUPERSTRUC-           

 TURES.  BY SELECTIVE TARGET DESIGNATION IN CLEAR AREAS AUTHORIZED BY           

 THE COGNIZANT PORT AUTHORITY, LIMITED ILLUMINATOR OPERATION CAN BE             

 ACCOMPLISHED.  THE ILLUMINATOR GENERATES HAZARDOUS MAIN BEAM RF                

 LEVELS OUT TO 1850 FEET.                                                       

                                                                                

         C.      EW SYSTEM AN/SLQ-32(V)3.  THE SLQ-32 SYSTEM SHALL HAVE THE     

 TRANSMITTER OUTBOARD SPECIAL TEST EQUIPMENT (TOSTE) INSTALLED TO               

 SUPPRESS RADIATION WHILE OPERATING IN PORT.                                    

         D.      RADAR SYSTEM AN/SPS-49.  SPS-49, WHILE ROTATING, DOES NOT      

 CREATE ANY RADHAZ AREAS, BUT EMI EFFECTS TO COMMERCIAL TV AND                  

 RADIO RECEIVERS MAY LIMIT ITS USE IN PORT.  CONTACT THE COGNIZANT              

 PORT AUTHORITY PRIOR TO OPERATION.  IF SPS-49 IS RADIATING WITH THE            

 ANTENNA STATIONARY, THE MAIN BEAM MINIMUM SAFE DISTANCE IS 440 FEET.           

         E.      RADAR SYSTEM AN/SPQ-9A.  DURING NORMAL OPERATION WITH THE      

 ANTENNA ROTATING, SPQ-9A DOES NOT CREATE A RADIATION HAZARD.  IF               

 SPQ-9A IS RADIATING WITH THE ANTENNA STATIONARY, THE MAIN BEAM                 

 MINIMUM SAFE DISTANCE IS 85 FEET.  IN THIS MODE THE ANTENNA SHALL BE           

 DIRECTED ONLY TO CLEAR AREAS AS AUTHORIZED BY THE COGNIZANT PORT               

 AUTHORITY.                                                                     

         F.      CLOSE IN WEAPON SYSTEM (CIWS).  CIWS SHALL BE DIRECTED ONLY    

 TO CLEAR AREAS AS AUTHORIZED BY THE COGNIZANT PORT AUTHORITY.  IN              

 THE TRACK MODE, THE BEAM GENERATES HAZARDOUS MAIN BEAM RF LEVELS               

 OUT TO 140 FEET.                                                               

         G.      RADAR SYSTEM AN/SPS-55.  DURING NORMAL OPERATION WITH THE      

 ANTENNA ROTATING SPS-55 DOES NOT CREATE A RADIATION HAZARD.  IF SPS-           

 55 IS RADIATING WITH THE ANTENNA STATIONARY, THE MAIN BEAM MINIMUM             

 SAFE DISTANCE IS 50 FEET.                                                      

         H.      AN/WSC-3 SATCOM.  WSC-3 CAN CREATE HAZARDOUS RADIATION         

 LEVELS OUT TO 15 FEET FROM THE WSC-1 ANTENNA.                                  

         I.      LN-66.  LN-66 PRODUCES HAZARDOUS RADIATION LEVELS OUT TO       

 TWO FEET FROM THE ANTENNA.                                                     

         J.      AN/SRQ-4 DIRECTIONAL ANTENNA (AS-3274/SRQ-4).  AN/SRQ-4 PRO-   

 DUCES HAZARDOUS MAIN BEAM RF LEVELS OUT TO 20 FEET.                            

         K.      OTHER RADIATION RESTRICTIONS MAY BE SPECIFIED BY THE PAR-      

 TICULAR PORT.  ADVANCE CONTACT WITH PORT AUTHORITIES SHOULD BE                 

 ESTABLISHED.                                                                   

                                                                                

 5.      RADHAZ PRECAUTIONS AT SEA:                                             

         A.      RADHAZ SAFE DISTANCES.  MAIN BEAM RADHAZ SAFE SEPARATION       

 DISTANCES SHOWN BELOW MUST BE MAINTAINED IN A MULTIPLE SHIP ENVIRON-           

 MENT.  PERSONNEL ON SHIPS ALONGSIDE CG-47 CLASS SHIPS MUST NOT BE              

 RADIATED BY THE MAIN BEAM OF RADARS LISTED BELOW IF THEY ARE WITHIN            

 THE MINIMUM SAFE DISTANCE.  RADIATING ELEMENTS NOT SHOWN DO NOT                

 CREATE RADHAZ CONDITIONS BEYOND THE SHIP BOUNDARIES IN THEIR NOR-              

 MAL OPERATING MODES.                                                           

                                                                                

                 RF SOURCE           MINIMUM SAFE DISTANCE                      

                                                                                

                                                                                

                                                                                

         AN/SPY-1 (HIGH POWER)            360 FT                                

         AN/SPY-1A (LOW POWER)             30 FT                                

         AN/SPG-62 (FCS MK 99)           1310 FT                                

         AN/SLO-32                         90 FT                                

         CIWS                              90 FT                                

                                                                                

                                                                                

         B.      MAN ALOFT.  ALL AREAS ABOVE THE 05 LEVEL AND THE HELICOPTER    

 LIGHTING MAINTENANCE PLATFORM ON THE 04 LEVEL ARE MAN ALOFT AREAS.             

 PROCEDURES SHALL BE ESTABLISHED TO ENSURE RADAR AND RADIO TRANS-               

 MITTERS FOR THESE AREAS ARE SECURED WHILE MEN ARE ALOFT.                       

         C.      WEATHER DECK.  THE 03 LEVEL FORWARD OF THE AN/SLQ-32 IS        

 HAZARDOUS WHEN THE ACTIVE EMITTERS ARE RADIATING.  PERSONNEL                   

 SHOULD BE RESTRICTED FROM THESE AREAS WHEN RADIATION IS POSSIBLE.              

 AREAS OF THE BRIDGE WINGS ARE EXPOSED TO RF LEVELS WHICH EXCEED THE            

 PERMISSIBLE EXPOSURE LIMITS DURING TRANSMISSION BY THE 10-30 MHZ TWIN          

 WHIP ANTENNA ATOP THE PILOT HOUSE, ANTENNA 2-3.  THE HAZARD CAN BE             

 MINIMIZED BY LIMITING HF TRANSMITTER POWER TO 500 WATTS OR BY RE-              

 STRICTING ACCESS TO THE BRIDGE WINGS DURING TRANSMISSION BY THE TWIN           

 WHIP.  ALL OTHER WEATHER DECK AREAS ARE SAFE.                                  

                                                                                

 6.      HERO PRECAUTIONS:                                                      

         A.      CIWS.  CIWS IS CONSIDERED HERO SUSCEPTIBLE IN SEVERAL FRE-     

 QUENCY RANGES.  THE HERO RESTRICTIONS ARE SPECIFIED IN OP 3565 ACN'S           

 4/3, 15/3, AND 19/3, REFERENCES G, H, I RESPECTIVELY.  HERO RELATED            

 AMMUNITION HANDLING PRECAUTIONS FOR CIWS ARE PROVIDED IN REF-                  

 ERENCES G AND J.  CIWS HERO RESTRICTIONS ARE SUMMARIZED BELOW.                 

                 (1)     TOUCHING OF THE 20MM ROUND PRIMER SHOULD BE AVOIDED    

 AT ALL TIMES.  DURING OPERATION REQUIRING ON DECK HANDLING OF BARE             

 (WITHOUT RADHAZ LINKS) 20MM ROUNDS, TRANSMITTERS IN THE 2 MHZ TO 1400          

 MHZ FREQUENCY RANGE SHOULD BE SECURED.                                         

                 (2)     WHEN TRAVELING IN COMPANY WITH OTHER SHIPS, PRE-       

 CAUTIONS SHOULD BE TAKEN TO AVOID DIRECT ILLUMINATION OF 20MM                  

 AMMUNITION (ON DECK, IN LOADERS OR MOUNTS) WITH FIRE CONTROL OR                

 SURFACE/AIR SEARCH RADARS IN THE 2.7 GHZ TO 8.4 GHZ FREQUENCY RANGE            

 WITHIN THE SPECIFIED SAFE DISTANCES.  SAFE DISTANCES ARE SPECIFIED IN          

 REFERENCES G AND H.  THIS RESTRICTION APPLIES TO RADIATION OF CG-47            

 CLASS SHIP CIWS BY OTHER SHIPS AND TO CG-47 CLASS SHIP RADIATION OF            

 OTHER SHIPS' CIWS.  THE SAFE DISTANCE SPECIFIED IN REFERENCE H FOR             

 AN/SPY-1A IS 1462 YARDS.  THERE ARE NO RESTRICTIONS ON ILLUMINATION OF         

 THE MOUNT IF LIVE AMMUNITION IS TOTALLY CONTAINED WITHIN THE DRUM              

 MAGAZINE (SEE REFERENCE I FOR DETAILED INSTRUCTIONS).                          

         B.      SRBOC.  AN/SLQ-32 RADIATION SHOULD BE INHIBITED WHEN CON-      

 DUCTING SRBOC HANDLING AND LOADING OPERATIONS.                                 

         C.      STANDARD MISSILE. SM-1 IS CONSIDERED HERO SUSCEPTIBLE AND      

 SHOULD NOT BE EXPOSED TO MAIN BEAM HIGH POWER ILLUMINATION BY THE              

 AN/SPY-1A PRIOR TO LAUNCH.  SM-2 IS HERO SAFE.                                 

         D.      ASROC.  ASROC CONFIGURED WITH ISA MK 4 MOD 0 IS HERO SAFE      

 AND THERE ARE NO HERO RESTRICTIONS ON OPERATIONS WITH THIS MISSILE.            

 ASROC CONFIGURED WITH ISA MK 3 MOD 2 IS HERO SUSCEPTIBLE AND SHOULD            

 NOT BE EXPOSED TO MAIN BEAM HIGH POWER ILLUMINATION BY THE AN/SPY-             

 1A OR TO MAIN BEAM ILLUMINATION BY THE AN/SPG-62.  ADDITIONALLY, HF            

 TRANSMISSION BY THE 10-30 MHZ TWIN WHIP ANTENNA ATOP THE PILOT HOUSE           

 SHOULD BE DISCONTINUED DURING HANDLING, LOADING OR PRESENCE OF                 

 ASROC CONFIGURED WITH ISA MK 3 MOD 2 IN THE VICINITY OF THE FORWARD            

 GMLS MK 26 LAUNCHER.                                                           

                                                                                

 7.      HELICOPTER OPERATIONS - THREE PROBLEM AREAS MUST BE CONSID-            

 ERED:                                                                          

                                                                                

         RADHAZ - ELECTROMAGNETIC RADIATION FROM THE SHIP'S SENSORS             

 COULD BE SUFFICIENTLY INTENSE TO CREATE A RADIATION HAZARD TO THE              

 HELICOPTER AIR CREW.                                                           

                                                                                

         HERO - ELECTROMAGNETIC RADIATION FROM OWNSHIP RADARS MIGHT             

 TRIGGER THE DETONATION OF ORDNANCE AND PYROTECHNICS ON THE                     

 HELICOPTER.                                                                    

                                                                                

         EMI/EMC - FRIENDLY JAMMING COULD RESULT FROM INTERFERENCES             

 BETWEEN THE SHIP AND HELICOPTER SENSORS.                                       

                                                                                

         A.      IN PEACETIME, NONOPERATIONAL EXERCISES, SENSORS SHOULD BE      

 INHIBITED OR REDUCED TO LOWER OUTPUT POWER TO ACCOMMODATE CON-                 

 VENTIONAL RECOVERIES AND LAUNCHES.                                             

         B.      UNDER WARTIME CONDITIONS, OPERATION OF INTERFERING             

 SENSORS SHOULD BE CONTROLLED TO MINIMIZE RISK.                                 

                                                                                

 8.      THIS INFORMATION WILL BE INCLUDED IN THE AEGIS CSTOM.